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	1010data OLAP	2000	Relational	OLAP
	3store Abandoned Project	2003	Triplestore / RDF	Abandoned Project
	4D	1984	Relational
	4store Abandoned Project	2009	Triplestore / RDF	Abandoned Project
AB	abhot Time-Series Forked Code Abandoned Project	2017	—	Time-Series Forked Code Abandoned Project
	Access Acquired Company	1992	Relational	Acquired Company
	Accumulo NoSQL	2008	Column Family / Wide-Column	NoSQL
	AceBase Web Browser	2018	Document / XML	Web Browser
	AceDB Abandoned Project	1989	—	Abandoned Project
	ActorDB Abandoned Project	2014	Relational	Abandoned Project
	Adabas	1971	Network
	Adaptive Server Enterprise Acquired Company	1987	Relational	Acquired Company
	Advantage Database Server xBase Acquired Company	1993	Relational	xBase Acquired Company
	Aerospike NoSQL AI-Assisted	2009	Document / XML, Key/Value, Vector	NoSQL AI-Assisted
AG	AgateDB Abandoned Project	2019	Key/Value	Abandoned Project
	AGEDB Middleware AI-Assisted	2019	Graph	Middleware AI-Assisted
	AgensGraph Forked Code Multi-Model Acquired Company	2013	Document / XML, Graph, Key/Value, Relational	Forked Code Multi-Model Acquired Company
	AionDB Multi-Model	2026	Graph, Relational, Vector	Multi-Model
	Aito	2017	—
	AKDB	2009	Relational
	Akiban Acquired Company Abandoned Project	2009	—	Acquired Company Abandoned Project
	Akumuli Abandoned Project	2013	—	Abandoned Project
	Akutan Abandoned Project	2019	Triplestore / RDF	Abandoned Project
	AlaSQL AI-Assisted	2014	Document / XML, Relational	AI-Assisted
AL	AlchemyDB Acquired Company Abandoned Project	2010	Relational	Acquired Company Abandoned Project
	Alenka Abandoned Project	2012	Relational	Abandoned Project
	Algebraix	2009	—
AL	Allbase/SQL	—	—
	AllegroGraph	2004	Triplestore / RDF
	AllocDB	2026	Relational
	AlloyDB OLAP Forked Code OLTP	2022	Relational	OLAP Forked Code OLTP
AL	allydb	2025	—
	Altibase OLTP	1999	Relational	OLTP
	Altinity Forked Code AI-Assisted Hosting Service	2017	—	Forked Code AI-Assisted Hosting Service
	Amelie OLTP	2023	Relational	OLTP
	Amisa Server Failed Company	2014	Document / XML	Failed Company
	AncelusDB	1983	Entity-Relationship
AN	AngstromDB Abandoned Project	2013	Key/Value	Abandoned Project
	AnnaDB Abandoned Project NoSQL	2021	Document / XML	Abandoned Project NoSQL
	AnnDB Nearest Neighbor Search	2020	Vector	Nearest Neighbor Search
	AntDB Forked Code	—	Relational	Forked Code
	Antfly	2026	—
	Antidote	2015	Key/Value
AN	AnuDB Serverless NoSQL	2025	Document / XML	Serverless NoSQL
	AnzoGraph	2007	Graph
AO	AODBM Abandoned Project	2011	—	Abandoned Project
AP	Apollo	2014	Document / XML
	Apollo xBase	1999	—	xBase
	Approach Acquired Company Abandoned Project	1991	Relational	Acquired Company Abandoned Project
	Arakoon Abandoned Project	2010	Key/Value	Abandoned Project
	ArangoDB Multi-Model AI-Assisted	2011	Document / XML, Graph, Key/Value	Multi-Model AI-Assisted
	ArcadeDB Forked Code AI-Assisted	2021	Document / XML, Graph, Key/Value, Relational	Forked Code AI-Assisted
	ArcticDB Time-Series OLAP AI-Assisted	2018	Relational	Time-Series OLAP AI-Assisted
AR	Ardb Abandoned Project	2013	Key/Value	Abandoned Project
	AresDB OLAP Abandoned Project	2018	Relational	OLAP Abandoned Project
	AriaSQL Abandoned Project	2024	Relational	Abandoned Project
	Ark	2026	—
	Arroyo Streaming	2023	—	Streaming
AS	Asami	2018	Graph
	Assassin Abandoned Project Peer-to-Peer	2020	Key/Value	Abandoned Project Peer-to-Peer
	Aster Data OLAP Acquired Company	2005	Relational	OLAP Acquired Company
	AsterixDB OLAP AI-Assisted	2009	Document / XML	OLAP AI-Assisted
	Atlas Time-Series AI-Assisted	2014	—	Time-Series AI-Assisted
	AtomicDB Failed Company	2011	Object-Oriented	Failed Company
	Atoti OLAP	2005	Relational	OLAP
	Aurora	2014	Relational
	Aurora DSQL Serverless OLTP	2023	Relational	Serverless OLTP
	AvantGraph	—	—
	AverageDB Parody / Joke	2024	Document / XML	Parody / Joke
	AvionDB Abandoned Project Peer-to-Peer	2020	Document / XML	Abandoned Project Peer-to-Peer
	AwaDB Abandoned Project Nearest Neighbor Search	2023	Document / XML, Vector	Abandoned Project Nearest Neighbor Search
	Axibase Time-Series Failed Company	2004	—	Time-Series Failed Company
	Axion Abandoned Project	2002	Relational	Abandoned Project
	Azure HorizonDB	2026	—
	Azure SQL Database	2009	Relational
	BabuDB Abandoned Project	2008	Key/Value	Abandoned Project
	BadgerDB AI-Assisted	2017	Key/Value	AI-Assisted
	BagelDB	2023	Vector
	Bagri Abandoned Project	2014	Document / XML	Abandoned Project
	BaikalDB	2018	Relational
	BangDB Multi-Model NoSQL	2015	Key/Value	Multi-Model NoSQL
	BaraDB Multi-Model AI-Assisted	2026	Column Family / Wide-Column, Document / XML, Graph	Multi-Model AI-Assisted
	Barrel DB DocDB	2025	—
	Barrel DB Vector	2025	—
	BaseX AI-Assisted	2007	Document / XML	AI-Assisted
	Basic	2023	Document / XML
	BASIS	—	Relational
	BayesDB Abandoned Project	2015	—	Abandoned Project
BB	bbolt Forked Code Revival Project	2017	Key/Value	Forked Code Revival Project
	BBoxDB AI-Assisted	2015	Array / Matrix	AI-Assisted
	Beagle SQL Abandoned Project	1996	Relational	Abandoned Project
	Bedrock Blockchain OLTP AI-Assisted	2016	Relational	Blockchain OLTP AI-Assisted
	BemiDB Acquired Company	2024	—	Acquired Company
	BergDB	2013	Document / XML
	Beringei Time-Series Abandoned Project	2015	Key/Value	Time-Series Abandoned Project
	Berkeley DB Acquired Company OLTP DBM	1994	Document / XML, Key/Value	Acquired Company OLTP DBM
	BerylDB	2021	Key/Value
	BigchainDB Abandoned Project Blockchain	2015	Document / XML, Key/Value	Abandoned Project Blockchain
	BigQuery OLAP Serverless	2010	Document / XML	OLAP Serverless
BI	BinaryRage Abandoned Project	2012	Key/Value	Abandoned Project
	Bitcask Abandoned Project	2019	Key/Value	Abandoned Project
	Bitsy	2013	Graph
	BitYota Acquired Company	2011	Relational	Acquired Company
	BlackRay Failed Company	2005	Relational	Failed Company
	Blazegraph Acquired Company Abandoned Project	2006	Graph, Triplestore / RDF	Acquired Company Abandoned Project
	BlazingSQL OLAP Abandoned Project Failed Company	2015	Relational	OLAP Abandoned Project Failed Company
	Bleve Search Engine AI-Assisted	2014	Document / XML, Vector	Search Engine AI-Assisted
	BlinkDB Abandoned Project	2012	Relational	Abandoned Project
	BlobCity Failed Company	2015	Document / XML, Relational	Failed Company
	Blueflood Time-Series Abandoned Project	2013	Column Family / Wide-Column	Time-Series Abandoned Project
	BoJack Abandoned Project	2016	Key/Value	Abandoned Project
	BoltDB Abandoned Project	2013	Key/Value	Abandoned Project
	BonsaiDb	2021	Key/Value
	BrightstarDB Abandoned Project	2012	Triplestore / RDF	Abandoned Project
BR	BroDB Parody / Joke	2024	Relational	Parody / Joke
	Brytlyt OLAP Forked Code Acquired Company	2013	Relational	OLAP Forked Code Acquired Company
	BTDB OLTP	2010	Key/Value, Object-Oriented	OLTP
	BTrDB Abandoned Project	2014	Relational	Abandoned Project
	Btrieve Acquired Company	1982	Network	Acquired Company
BU	Bubba	1990	—
	bugfruit Abandoned Project	2022	Key/Value	Abandoned Project
BU	Bunny Database	—	—
	BuntDB OLTP	2016	Key/Value	OLTP
	BusTub	2019	Relational
	ByConity OLAP	2020	Relational	OLAP
	Caché	1997	Array / Matrix
	Cachegrand Cache	2018	Key/Value	Cache
CA	Calvin Abandoned Project	2012	Relational	Abandoned Project
CA	CamaDB Web Browser Abandoned Project NoSQL	2021	Document / XML	Web Browser Abandoned Project NoSQL
	CapyDB Nearest Neighbor Search	2024	Document / XML	Nearest Neighbor Search
	CaskDB	2022	Key/Value
	Cassandra NoSQL AI-Assisted	2008	Key/Value, Column Family / Wide-Column	NoSQL AI-Assisted
	CastleDB	2012	Document / XML
	Cayley	2014	Triplestore / RDF
CD	cdb Immutable	1996	Key/Value	Immutable
	Cedalio Blockchain	2022	Document / XML	Blockchain
	CedarDB OLAP Forked Code OLTP	2023	Relational, Array / Matrix	OLAP Forked Code OLTP
CH	ChaiSQL	2018	Document / XML
	chaozzDB Abandoned Project	2008	—	Abandoned Project
	chDB OLAP Acquired Company AI-Assisted	2023	Relational	OLAP Acquired Company AI-Assisted
	Cheetah xBase	2005	Relational	xBase
	CheetahDB	2018	Relational
	Chroma Nearest Neighbor Search AI-Assisted	2022	Document / XML	Nearest Neighbor Search AI-Assisted
CH	chromem-go Nearest Neighbor Search	2023	Vector	Nearest Neighbor Search
	ChromoDB Abandoned Project	2024	Key/Value	Abandoned Project
	Chronicle Map AI-Assisted	2014	Key/Value	AI-Assisted
	Chronix Time-Series Abandoned Project	2015	—	Time-Series Abandoned Project
	Citus OLAP Acquired Company AI-Assisted	2010	Relational	OLAP Acquired Company AI-Assisted
	ClearDB Acquired Company	2010	Relational	Acquired Company
	ClickHouse OLAP AI-Assisted	2016	Relational	OLAP AI-Assisted
	ClickHouse Cloud Hosting Service	2022	—	Hosting Service
	CloseVector Nearest Neighbor Search	2023	Document / XML, Vector	Nearest Neighbor Search
	Cloudant Acquired Company OLTP NoSQL	2008	Document / XML	Acquired Company OLTP NoSQL
	Cloudberry OLAP Forked Code Revival Project	2023	Relational	OLAP Forked Code Revival Project
	Cloud BigTable	2005	Column Family / Wide-Column
	Cloud Datastore NoSQL	2013	—	NoSQL
	Cloud Firestore Serverless	2017	Document / XML	Serverless
	CloudKit Abandoned Project	2008	Document / XML	Abandoned Project
	Cloud Memorystore Cache Hosting Service	—	—	Cache Hosting Service
CL	CloudSearch Search Engine	2012	Document / XML	Search Engine
	Cloud Spanner NewSQL	2007	—	NewSQL
	Cloud SQL Hosting Service	2012	Relational	Hosting Service
	CloverDB NoSQL AI-Assisted	2022	Document / XML	NoSQL AI-Assisted
	Clusterpoint Failed Company NoSQL	2006	Document / XML	Failed Company NoSQL
	Clustrix NewSQL Acquired Company OLTP	2006	Relational	NewSQL Acquired Company OLTP
	CnosDB Time-Series	2021	Relational	Time-Series
	CockroachDB NewSQL OLTP AI-Assisted	2014	Relational	NewSQL OLTP AI-Assisted
	CodernityDB	2011	Key/Value
	CoGaDB Abandoned Project	2012	Relational	Abandoned Project
	CogDB	2017	Triplestore / RDF
	Coherence Cache Acquired Company	2000	Object-Oriented	Cache Acquired Company
	Column	2021	Relational
	Comdb2 AI-Assisted	2004	Relational	AI-Assisted
	Compass Abandoned Project Search Engine	2006	Document / XML, Object-Oriented	Abandoned Project Search Engine
	CompleteDB Abandoned Project OLTP	2012	Relational	Abandoned Project OLTP
	ComposeDB Blockchain	2022	Graph	Blockchain
	ComputeDB OLAP Acquired Company Abandoned Project	2015	Relational	OLAP Acquired Company Abandoned Project
	ConceptBase.cc	1995	Object-Oriented
	Concourse	2012	Document / XML
	Condensation Abandoned Project Blockchain	2020	Object-Oriented	Abandoned Project Blockchain
CO	ConfluxDB	2014	—
	Consus Abandoned Project	2015	Key/Value	Abandoned Project
	Consus	2004	Relational
CO	CORAL	1988	—
	CoreObject Abandoned Project	2007	Object-Oriented	Abandoned Project
	CornerStone Acquired Company	1985	Relational	Acquired Company
	CortexDB Multi-Model NoSQL	2014	Document / XML, Key/Value	Multi-Model NoSQL
	Cosmos DB	2015	Key/Value, Graph, Column Family / Wide-Column
	Couchbase NoSQL	2010	Key/Value, Document / XML	NoSQL
	CouchDB NoSQL	2005	Document / XML	NoSQL
	CovenantSQL Abandoned Project Blockchain	2018	Relational	Abandoned Project Blockchain
	CozoDB	2022	Relational
CQ	CQL++ Failed Company	1994	Relational	Failed Company
CQ	CQLite Abandoned Project	2021	Graph	Abandoned Project
	CrateDB	2014	—
	Crescando Abandoned Project	2009	Relational	Abandoned Project
	CrossDB	2019	Relational
	CrowdDB	2011	Relational
	CruzDB	2016	—
	CSQL Failed Company	2005	Relational	Failed Company
	C-Store Abandoned Project	2005	Relational	Abandoned Project
	CSV Comp DB	2007	Relational
	cubeSQL Acquired Company	2003	Relational	Acquired Company
	CubicWeb	2000	Graph
	Cubrick	2016	Column Family / Wide-Column
	Cubrid AI-Assisted	2008	Relational	AI-Assisted
	CurioDB Abandoned Project NoSQL	2015	Key/Value	Abandoned Project NoSQL
	CursusDB Abandoned Project NoSQL	2023	Document / XML	Abandoned Project NoSQL
	D3 Acquired Company	1999	Relational	Acquired Company
	Daffodil DB	2003	Relational
	DaggerDB	2014	Relational
	DalmatinerDB Abandoned Project	2014	—	Abandoned Project
	Dare-DB NoSQL	2024	Key/Value	NoSQL
	dashDB Hosting Service	2014	—	Hosting Service
	Databend AI-Assisted	2020	Relational	AI-Assisted
DA	DataBlitz OLTP	1993	Relational	OLTP
	DataEase Acquired Company OLTP	1981	Relational	Acquired Company OLTP
	DataFusion Query Engine AI-Assisted	2016	Relational	Query Engine AI-Assisted
	Datahike AI-Assisted	2018	—	AI-Assisted
	Datalevin	2020	Document / XML
	DATAllegro OLAP Acquired Company	2003	Relational	OLAP Acquired Company
	Datameer	2009	—
	Datascope	1996	Relational
	DataScript	2014	Key/Value
	DataStax	2010	—
	Dataupia Failed Company	2005	Relational	Failed Company
	Datomic Acquired Company	2012	Key/Value	Acquired Company
	Db2	1983	Document / XML, Relational
	DB4IoT	2016	Document / XML
	db4o Acquired Company Abandoned Project	2000	Object-Oriented	Acquired Company Abandoned Project
	DB5 Abandoned Project Nearest Neighbor Search	2023	Document / XML, Vector	Abandoned Project Nearest Neighbor Search
	DB9 Serverless OLTP	2026	Relational	Serverless OLTP
	dBASE xBase	1979	Relational	xBase
	dbeel Abandoned Project NoSQL	2023	Document / XML	Abandoned Project NoSQL
	DBIX	1996	—
	DBMaker	1994	Relational
DB	DBMS-20	—	Network
DB	DBOMP	1968	Hierarchical
	DBreeze Multi-Model	2012	Document / XML, Key/Value	Multi-Model
	DBx1000 Abandoned Project	2014	Relational	Abandoned Project
	DeepDB Abandoned Project Failed Company	2010	Relational	Abandoned Project Failed Company
	DefraDB Peer-to-Peer AI-Assisted	2019	Document / XML	Peer-to-Peer AI-Assisted
	DegDB Abandoned Project	2015	Graph	Abandoned Project
	Delta Lake AI-Assisted	2019	Column Family / Wide-Column	AI-Assisted
	DensoDB Abandoned Project	2012	Document / XML	Abandoned Project
	Derby Acquired Company Abandoned Project OLTP	1997	Relational	Acquired Company Abandoned Project OLTP
	DeveelDB Abandoned Project OLTP	2009	Relational	Abandoned Project OLTP
	DeviceSQL Streaming	1998	Relational	Streaming
	DGraph Acquired Company AI-Assisted	2015	Graph	Acquired Company AI-Assisted
	DiceDB OLTP	2022	Key/Value	OLTP
	DiggyDB Abandoned Project	2021	Document / XML	Abandoned Project
DI	DIRECT OLTP	1978	Relational	OLTP
DI	discodb Parody / Joke	2026	—	Parody / Joke
	DittoBitto	2001	Relational
	Djondb Abandoned Project	2012	Document / XML	Abandoned Project
	DMSII	1972	Network
	Dnaerys	—	—
	DocumentDB Middleware NoSQL AI-Assisted	2023	Document / XML	Middleware NoSQL AI-Assisted
	DocumentDB	2019	Document / XML
	DolphinDB Time-Series	2018	Relational	Time-Series
	Dolt Versioning AI-Assisted	2018	Relational	Versioning AI-Assisted
	Doris OLAP AI-Assisted	2017	Relational	OLAP AI-Assisted
	Doxa Abandoned Project	2021	Document / XML	Abandoned Project
DQ	Dqlite	2017	Relational
	Dragonfly Cache AI-Assisted	2021	Key/Value	Cache AI-Assisted
	Dremio OLAP Query Engine Acquired Company Data Lake	2015	Relational	OLAP Query Engine Acquired Company Data Lake
DR	DriftDB Immutable AI-Assisted	2025	Relational	Immutable AI-Assisted
	Drill OLAP AI-Assisted	2012	Column Family / Wide-Column	OLAP AI-Assisted
	Drizzle Forked Code Abandoned Project	2008	Relational	Forked Code Abandoned Project
	Druid OLAP AI-Assisted	2011	Column Family / Wide-Column	OLAP AI-Assisted
	DuckDB OLAP AI-Assisted	2018	Relational	OLAP AI-Assisted
	DuctileDB Abandoned Project	2015	Graph	Abandoned Project
	DyBASE	—	Object-Oriented
	Dydra	2010	Triplestore / RDF
	DynamoDB OLTP NoSQL	2012	Document / XML, Key/Value	OLTP NoSQL
	DynomiteDB Abandoned Project	2012	—	Abandoned Project
	Earthstar Peer-to-Peer	2020	Document / XML	Peer-to-Peer
EA	EaseDB Abandoned Project	2013	Document / XML	Abandoned Project
	EasyDB Failed Company	2019	Document / XML	Failed Company
	EchoDB	2021	Key/Value
	EcoDB Failed Company	2018	Document / XML	Failed Company
	EdgelessDB Abandoned Project	2021	Relational	Abandoned Project
	Edis Abandoned Project NoSQL	2010	Key/Value	Abandoned Project NoSQL
	EffiProz Abandoned Project	—	Relational	Abandoned Project
	Ehcache Cache Acquired Company	2003	Key/Value	Cache Acquired Company
	EinsteinDB Abandoned Project	2019	Key/Value	Abandoned Project
	EJDB	2012	Key/Value, Document / XML
	ekoDB	2024	Document / XML
	Elara DB Abandoned Project	2021	Key/Value	Abandoned Project
	ElaSQL Abandoned Project	2016	Relational	Abandoned Project
	Elasticsearch Search Engine NoSQL AI-Assisted	2004	Document / XML	Search Engine NoSQL AI-Assisted
	ElephantDB Abandoned Project	2011	Key/Value	Abandoned Project
	ElevateDB	2006	Relational
	Elevator Abandoned Project	2012	Key/Value	Abandoned Project
	EliasDB Abandoned Project	2016	Graph	Abandoned Project
	Elliptics Abandoned Project	2009	Key/Value	Abandoned Project
	Eloquera	2008	Object-Oriented
EM	EmbedDB Time-Series	2023	Relational	Time-Series
	Empress	1979	Relational
EN	Encompass	1981	Relational
	Endatabas OLAP Abandoned Project OLTP Immutable	2023	Document / XML, Relational	OLAP Abandoned Project OLTP Immutable
	Endeca OLAP Acquired Company	1999	Document / XML	OLAP Acquired Company
	Endee AI-Assisted	2026	—	AI-Assisted
	Engram AI-Assisted	2026	Graph	AI-Assisted
	Engula	2022	Key/Value
EN	EnnoDB Abandoned Project	2012	Key/Value	Abandoned Project
	Epsilla Nearest Neighbor Search	2023	Array / Matrix	Nearest Neighbor Search
	EraDB Acquired Company	2019	Document / XML	Acquired Company
	EsgynDB Failed Company	2015	Relational	Failed Company
	Espresso	2011	Document / XML
	Essbase OLAP Acquired Company	1992	Array / Matrix	OLAP Acquired Company
	Essentia Failed Company	—	Object-Oriented, Relational	Failed Company
	etcd Acquired Company	2013	Key/Value	Acquired Company
	EuclidesDB Abandoned Project	2018	Array / Matrix	Abandoned Project
	EuclidOLAP OLAP	2022	Array / Matrix	OLAP
	Eva Abandoned Project	—	Entity-Attribute-Value	Abandoned Project
	EVA DB Abandoned Project	2018	Relational	Abandoned Project
	EVCache Cache	2012	Key/Value	Cache
	EventQL OLAP Abandoned Project	2014	Relational	OLAP Abandoned Project
	EventSourcingDB Time-Series Immutable	2022	Document / XML	Time-Series Immutable
	evitaDB AI-Assisted	2020	Document / XML	AI-Assisted
EV	EvolvSQL OLTP	2026	Relational	OLTP
	Exasol	2000	Relational
	eXist-db NoSQL AI-Assisted	2000	Document / XML	NoSQL AI-Assisted
	Exorbyte	2000	—
	Express Acquired Company	1970	Array / Matrix	Acquired Company
	ExtendDB Middleware AI-Assisted	2026	Key/Value, Document / XML	Middleware AI-Assisted
EX	Extensible Storage Engine	1994	Key/Value
	eXtremeDB Cache Time-Series OLTP Middleware	2001	Column Family / Wide-Column, Entity-Relationship, Key/Value, Relational	Cache Time-Series OLTP Middleware
	EyeDB Abandoned Project	1992	Object-Oriented	Abandoned Project
	eyros Time-Series Abandoned Project	2018	Array / Matrix	Time-Series Abandoned Project
	FairCom DB	1984	—
	Falcon Abandoned Project	2006	—	Abandoned Project
	FalkorDB AI-Assisted	2023	Graph	AI-Assisted
	Fallen-8 Abandoned Project	2011	Graph	Abandoned Project
	FastDB	2011	Relational
	FASTER	2018	Key/Value
	FastObjects Acquired Company	1993	Object-Oriented	Acquired Company
	FatDB Cache Failed Company NoSQL	2012	Key/Value	Cache Failed Company NoSQL
	FathomDB Acquired Company Hosting Service	2009	—	Acquired Company Hosting Service
	FaunaDB Serverless Failed Company	2012	Document / XML, Graph, Key/Value, Relational	Serverless Failed Company
	FBase Time-Series	2022	Relational	Time-Series
	FeatureBase Abandoned Project Search Engine	2017	Relational	Abandoned Project Search Engine
	FeatureForm Acquired Company Nearest Neighbor Search	2020	Vector	Acquired Company Nearest Neighbor Search
	FerresDB AI-Assisted	2026	—	AI-Assisted
	FerretDB AI-Assisted	2021	Document / XML	AI-Assisted
FE	Ferrite OLTP	2024	Relational	OLTP
FI	FileDb Abandoned Project NoSQL	2011	Relational	Abandoned Project NoSQL
	FileDB Abandoned Project	2010	Key/Value	Abandoned Project
	FileMaker Acquired Company	1985	Relational	Acquired Company
	FiloDB	2015	—
	FinchDB	2015	Document / XML
	FineDB Abandoned Project NoSQL	2013	Key/Value	Abandoned Project NoSQL
	Firebase Acquired Company NoSQL	2011	Document / XML	Acquired Company NoSQL
	Firebird AI-Assisted	2000	Relational	AI-Assisted
	Firebolt OLAP Forked Code	2020	Relational	OLAP Forked Code
	Fireproof Peer-to-Peer AI-Assisted	2022	Document / XML	Peer-to-Peer AI-Assisted
	FirstSQL/J Failed Company	2001	Relational	Failed Company
	Fjall OLTP	2023	Key/Value	OLTP
	FlashDB	2020	Key/Value
FL	FlashFiler Failed Company	1985	—	Failed Company
FL	FleetDB Abandoned Project	2009	Document / XML	Abandoned Project
FL	FlockDB Abandoned Project	2010	Graph	Abandoned Project
	Floe OLAP Forked Code Data Lake	2025	Relational	OLAP Forked Code Data Lake
	Fluree Blockchain AI-Assisted	2017	Document / XML, Graph, Triplestore / RDF, Relational	Blockchain AI-Assisted
FO	Fongo Abandoned Project NoSQL	2012	Document / XML	Abandoned Project NoSQL
FO	ForestDB Abandoned Project	2013	Key/Value	Abandoned Project
	FoundationDB Acquired Company OLTP AI-Assisted	2009	Key/Value	Acquired Company OLTP AI-Assisted
	FoxPro xBase	1984	Relational	xBase
	FramerD	1996	Object-Oriented
	Frigatebird OLAP	2025	Relational	OLAP
	FrontBase	1993	Relational
	FrostDB Time-Series	2022	Column Family / Wide-Column	Time-Series
	FuelDB Abandoned Project	2014	Document / XML	Abandoned Project
	FusionDB Abandoned Project	2019	Document / XML	Abandoned Project
GA	Gadfly Abandoned Project	1994	Relational	Abandoned Project
	Gaffer Abandoned Project	2016	Entity-Relationship	Abandoned Project
	Gaia Abandoned Project Failed Company	2020	Object-Oriented	Abandoned Project Failed Company
	Galaxybase	2013	Graph
GA	Gamma OLAP Abandoned Project OLTP	1986	Relational	OLAP Abandoned Project OLTP
	Garnet Cache AI-Assisted	2021	Key/Value	Cache AI-Assisted
	GaussDB	2011	Relational
	GBase	2010	—
	GDBM DBM	1990	Key/Value	DBM
	Gel OLAP AI-Assisted	2018	Relational	OLAP AI-Assisted
	GemStone/S	1986	Object-Oriented
	Genesis DB Streaming	2025	Document / XML	Streaming
	GenieDB Failed Company Hosting Service	2008	Relational	Failed Company Hosting Service
	GenomicsDB	2016	Array / Matrix
	GenosDB AI-Assisted	2025	—	AI-Assisted
	Geode Cache Forked Code OLTP NoSQL	2015	Key/Value	Cache Forked Code OLTP NoSQL
	GeoSpock DB Failed Company	2013	Relational	Failed Company
	GhostDB Cache Abandoned Project	2020	Key/Value	Cache Abandoned Project
	GigaBASE	—	Relational
GI	GitDB Versioning	2026	—	Versioning
	GlareDB Abandoned Project Middleware AI-Assisted	2022	Relational	Abandoned Project Middleware AI-Assisted
	GlobalsDB	2011	Array / Matrix
	Glowdust	2023	Relational
	Gnocchi Time-Series Middleware	2014	Relational	Time-Series Middleware
GN	GNU SQL Server	1997	Relational
	GoatDB Web Browser AI-Assisted	2024	Document / XML	Web Browser AI-Assisted
	GoldenDB	—	—
	Goldilocks	2010	Relational
GO	GOLD STAR	1970	—
	GOODS	—	Object-Oriented
GO	Google F1	2013	Relational
	GoshawkDB Abandoned Project	2015	Object-Oriented	Abandoned Project
GR	GRACE Abandoned Project	1981	Relational	Abandoned Project
	Grafeo AI-Assisted	2026	—	AI-Assisted
	GraphBase	—	Graph
	GraphDB	2000	Triplestore / RDF
	GrapheekDB Abandoned Project	2014	Key/Value, Graph	Abandoned Project
	GrapheneDB Hosting Service	2012	Graph	Hosting Service
	Graphik Abandoned Project	2020	Document / XML	Abandoned Project
GR	GraphLite	2025	—
	Graviton Versioning Abandoned Project	2020	Key/Value	Versioning Abandoned Project
	GreatSQL	2020	Relational
	Greenplum OLAP Forked Code Acquired Company	2003	Relational	OLAP Forked Code Acquired Company
	GreptimeDB Time-Series AI-Assisted	2022	Relational	Time-Series AI-Assisted
	GridDB	2011	Key/Value
	GridGain	2007	Key/Value
	Groonga AI-Assisted	2009	—	AI-Assisted
	GT.M	1986	Key/Value
	GUN Peer-to-Peer	2014	Graph	Peer-to-Peer
	H2	2004	Relational
	Hadapt OLAP Acquired Company Middleware	2009	Relational	OLAP Acquired Company Middleware
	Hadoop OLAP AI-Assisted	2006	—	OLAP AI-Assisted
	HailDB Abandoned Project	2010	Key/Value	Abandoned Project
HA	Haixun	—	—
HA	HaloDB Abandoned Project	2017	Key/Value	Abandoned Project
HA	HaloDB Revive Revival Project	2017	—	Revival Project
	HampusDB	2006	Key/Value
	HANA	2010	Column Family / Wide-Column
HA	HanoiDB Abandoned Project	2012	Key/Value	Abandoned Project
	HarperDB Serverless NoSQL	2017	Document / XML	Serverless NoSQL
	HAWQ OLAP Abandoned Project Middleware	2015	Relational	OLAP Abandoned Project Middleware
HA	HaystackDB Abandoned Project Nearest Neighbor Search MMAP	2024	Vector	Abandoned Project Nearest Neighbor Search MMAP
	Hazelcast Cache	2008	Key/Value	Cache
	HBase NoSQL	2007	Column Family / Wide-Column	NoSQL
	HeavyDB OLAP Acquired Company Abandoned Project	2013	Relational	OLAP Acquired Company Abandoned Project
	Hekaton OLTP	2012	Relational	OLTP
HE	HelinDB	2021	—
	Helium Failed Company	2017	Key/Value	Failed Company
	HelixDB OLTP Nearest Neighbor Search AI-Assisted	2024	Graph, Vector	OLTP Nearest Neighbor Search AI-Assisted
	HerdDB	2016	Relational
	Heroic Abandoned Project	2015	Key/Value	Abandoned Project
	HexaDB	2023	Relational
	HexxlaDB AI-Assisted	2026	—	AI-Assisted
	HFSQL	—	—
	Hibari Acquired Company Abandoned Project	2005	Key/Value	Acquired Company Abandoned Project
	HighContext Serverless	2023	Key/Value	Serverless
HI	hipsterDB Parody / Joke Abandoned Project	2013	Key/Value	Parody / Joke Abandoned Project
	HiRDB	1994	Document / XML, Relational
	Histore Abandoned Project	2018	Key/Value	Abandoned Project
	Hive OLAP	2010	Relational	OLAP
	Hive Abandoned Project	2019	Key/Value	Abandoned Project
	HollowDB Abandoned Project Blockchain	2023	Key/Value	Abandoned Project Blockchain
	HoraeDB Time-Series Abandoned Project	2021	Relational	Time-Series Abandoned Project
HO	HorizonDB Geospatial	2025	Document / XML	Geospatial
	hss.db	2009	Relational
	H-Store NewSQL Abandoned Project OLTP	2006	Relational	NewSQL Abandoned Project OLTP
	HStreamDB Streaming	2020	Relational	Streaming
	HugeGraph Middleware AI-Assisted	2017	Graph	Middleware AI-Assisted
	Husky Time-Series	2020	Document / XML	Time-Series
	Hydra OLAP Abandoned Project Failed Company	2022	Relational	OLAP Abandoned Project Failed Company
HY	HydrAIDE AI-Assisted	2025	—	AI-Assisted
	HyPer OLAP Acquired Company OLTP	2010	Relational	OLAP Acquired Company OLTP
	HyperDB Parody / Joke Nearest Neighbor Search	2023	Document / XML, Vector	Parody / Joke Nearest Neighbor Search
	HyperDex Abandoned Project NoSQL	2011	Key/Value	Abandoned Project NoSQL
	HyperGraphDB	2007	Graph
	HyperSQL	2001	Relational
	Hypertable Acquired Company Abandoned Project	2008	Column Family / Wide-Column	Acquired Company Abandoned Project
	Hyrise OLAP	2009	Relational	OLAP
	iBoxDB Serverless Mobile NoSQL	2014	Document / XML	Serverless Mobile NoSQL
	Icecoal Abandoned Project	2020	Relational	Abandoned Project
	IceFireDB	2021	Key/Value
	IDMS	1973	Network
	Ignite	2014	Key/Value
	Illustra Acquired Company OLTP	1992	Relational	Acquired Company OLTP
	ImmortalDB Web Browser	2018	Key/Value	Web Browser
	Immudb Immutable AI-Assisted	2019	Key/Value	Immutable AI-Assisted
	Impala OLAP AI-Assisted	2013	Relational	OLAP AI-Assisted
	IMS OLTP	1966	Hierarchical	OLTP
	Indica	2014	—
	IndraDB	2016	Graph
	InfiniDB OLAP Abandoned Project Failed Company	2000	Relational	OLAP Abandoned Project Failed Company
	Infinispan Cache	2009	Key/Value	Cache
	InfiniSQL Abandoned Project OLTP	2013	Relational	Abandoned Project OLTP
	InfiniteGraph	2010	Graph
	Infinity Nearest Neighbor Search	2022	Relational	Nearest Neighbor Search
	InfinityDB	2002	Key/Value, Graph, Array / Matrix, Hierarchical, Relational
	Infino Query Engine Nearest Neighbor Search	—	Relational	Query Engine Nearest Neighbor Search
	InfluxDB Time-Series AI-Assisted	2013	Column Family / Wide-Column	Time-Series AI-Assisted
	Infobright OLAP Acquired Company	2005	Relational	OLAP Acquired Company
	InfoFrame Abandoned Project	2013	Relational	Abandoned Project
	InfoGrid	2008	Graph
	Informix Acquired Company	1980	Relational	Acquired Company
	Ingres Acquired Company	1974	Relational	Acquired Company
	InMemory.Net	2014	Relational
	Instant	—	—
	InstantDB Failed Company	1997	Relational	Failed Company
IN	Integrated Data Store	1964	Network
	InterBase Acquired Company	1984	Relational	Acquired Company
	IonDB Abandoned Project	2015	Key/Value	Abandoned Project
	IoTDB Time-Series AI-Assisted	2017	Hierarchical	Time-Series AI-Assisted
	IQ Acquired Company	1992	Relational	Acquired Company
	IQrypt Failed Company	2015	Document / XML	Failed Company
IR	IRIS	—	—
	Irmin	2013	Document / XML
	IssunDB	2026	—
	ITTIA DB Time-Series OLTP	2000	Relational	Time-Series OLTP
	Jackrabbit	2004	Object-Oriented
	Jade	1996	Object-Oriented
	JaguarDB Nearest Neighbor Search	2017	Array / Matrix, Key/Value	Nearest Neighbor Search
JA	JameSQL NoSQL	2024	Document / XML	NoSQL
	JanusGraph Acquired Company	2012	Graph	Acquired Company
	JasDB	2013	Document / XML
	jasonisnthappy OLTP	2025	Document / XML	OLTP
	Jazz AI-Assisted	2026	Relational	AI-Assisted
	jBASE Acquired Company	1989	Multi-Value	Acquired Company
	Jena AI-Assisted	2000	Triplestore / RDF	AI-Assisted
	JinDB Abandoned Project	2019	—	Abandoned Project
	Joedb	2014	Relational
	JoinBase Time-Series Abandoned Project	—	Relational	Time-Series Abandoned Project
JS	JSDB Abandoned Project	2020	Document / XML	Abandoned Project
	JSONBin.io	2017	Document / XML
	jsonstore.io Abandoned Project	2018	Document / XML	Abandoned Project
	JSqlDb	2017	Document / XML
	JuliaDB Abandoned Project	2017	Relational	Abandoned Project
JU	JunoDB Abandoned Project NoSQL	—	Key/Value	Abandoned Project NoSQL
	JustinDB Abandoned Project	2015	Key/Value	Abandoned Project
	Just Logic/SQL	1994	Relational
	JustOneDB Acquired Company	2010	Relational	Acquired Company
	k4 Abandoned Project	2024	—	Abandoned Project
KA	KahaDB	—	—
	Kai Abandoned Project	2008	Key/Value	Abandoned Project
	KairosDB Time-Series	2013	—	Time-Series
	KantoDB OLTP	2025	Relational	OLTP
	Kappa Abandoned Project	1989	Relational	Abandoned Project
KA	KarelDB	2019	Relational
	Kdb+ Acquired Company	1998	Relational	Acquired Company
KE	KekeDB	—	Relational
	KektorDB Nearest Neighbor Search	2025	Graph	Nearest Neighbor Search
	KenobiDB Abandoned Project Middleware	2019	Document / XML	Abandoned Project Middleware
	Kerf	2014	—
	KeyDB Acquired Company Abandoned Project NoSQL	2019	—	Acquired Company Abandoned Project NoSQL
	Kinetica OLAP	2009	Relational	OLAP
	Kingbase	1999	—
KI	KingDB Abandoned Project MMAP	2012	Key/Value	Abandoned Project MMAP
	Kinto NoSQL AI-Assisted	2014	Document / XML	NoSQL AI-Assisted
	KirbyBase Abandoned Project	2003	—	Abandoned Project
	KitaroDB	2012	Key/Value
	Kognitio	—	—
KR	Krati Abandoned Project OLTP NoSQL	2010	Key/Value	Abandoned Project OLTP NoSQL
	Kronicler	2025	—
	Kronotop NoSQL	2023	Document / XML	NoSQL
	ksqlDB Streaming AI-Assisted	2017	Key/Value, Relational	Streaming AI-Assisted
	Kubl Acquired Company	1994	Relational	Acquired Company
	Kudu OLTP	2016	Relational	OLTP
	Kunlun Abandoned Project	2019	Relational	Abandoned Project
	KurrentDB Time-Series AI-Assisted	2012	Document / XML	Time-Series AI-Assisted
	Kuzu Acquired Company Abandoned Project Nearest Neighbor Search	2020	Graph	Acquired Company Abandoned Project Nearest Neighbor Search
	KVdb NoSQL	2018	Key/Value	NoSQL
KV	KVDB	2026	—
	Kvrocks NoSQL AI-Assisted	2019	Key/Value	NoSQL AI-Assisted
	Kylin	2013	Key/Value
	Kyoto Cabinet	2009	Key/Value
KY	Kyoto Tycoon	—	Key/Value
	Kyuubi Middleware AI-Assisted	2017	Relational	Middleware AI-Assisted
	LadybugDB Forked Code Revival Project AI-Assisted	2025	Graph	Forked Code Revival Project AI-Assisted
	lakeql Query Engine AI-Assisted	2026	Relational	Query Engine AI-Assisted
	LanceDB Search Engine AI-Assisted	2023	Document / XML	Search Engine AI-Assisted
LA	Lazer	2013	Document / XML
	LazyDB	2020	Document / XML
	Lealone	2012	Relational
	LeanStore OLTP	2018	Key/Value	OLTP
	LeanXcale OLAP OLTP	2010	Relational	OLAP OLTP
	LEAP	1997	Relational
	LedisDB Abandoned Project NoSQL	2014	Key/Value	Abandoned Project NoSQL
	LesbianDB Abandoned Project	2022	Document / XML	Abandoned Project
	LevelDB MMAP	2011	Key/Value	MMAP
LI	libmdbx Forked Code MMAP	2015	Key/Value	Forked Code MMAP
	libSQL Forked Code OLTP	2022	Relational	Forked Code OLTP
	LightCloud Abandoned Project	2009	Key/Value	Abandoned Project
	LightDB Abandoned Project	2017	Array / Matrix	Abandoned Project
	LightDB NoSQL	2021	Document / XML	NoSQL
LI	LINCKS	—	Object-Oriented
	LinDB	2019	Column Family / Wide-Column
LI	LineairDB AI-Assisted	2020	Key/Value	AI-Assisted
	LingoDB OLAP AI-Assisted	2021	Relational	OLAP AI-Assisted
	LintDB Nearest Neighbor Search	2024	Vector	Nearest Neighbor Search
	Linter	1990	Relational
	LiteDB	2014	Document / XML
LI	LittleD Abandoned Project	—	—	Abandoned Project
LL	LlamaDB Abandoned Project	2015	—	Abandoned Project
	LMDB MMAP DBM AI-Assisted	2011	Key/Value	MMAP DBM AI-Assisted
	lnx Search Engine	—	Document / XML	Search Engine
	LocalSQL	2001	Relational
	LocustDB	2017	Relational
	LogicBlox Acquired Company	—	—	Acquired Company
	LogosDB AI-Assisted	2026	Vector	AI-Assisted
	LokiJS Abandoned Project	2013	Document / XML	Abandoned Project
LO	LokiVector	2013	—
	LonaDB NoSQL	2023	Document / XML	NoSQL
	LotusDB OLTP	2021	Key/Value	OLTP
	Lovefield Web Browser Abandoned Project	2014	Relational	Web Browser Abandoned Project
LO	LowDB	2014	Document / XML
	Lucene Search Engine MMAP AI-Assisted	1999	Document / XML	Search Engine MMAP AI-Assisted
	LucidDB OLAP Abandoned Project	2004	Relational	OLAP Abandoned Project
	LungoDB	2019	Document / XML
	M3DB Time-Series AI-Assisted	2018	Relational	Time-Series AI-Assisted
	Machbase Time-Series	2017	Relational	Time-Series
	madIS	2009	Relational
	Magma	2002	Object-Oriented
	MammothDB OLAP Acquired Company	2012	Relational	OLAP Acquired Company
	MangoDB Parody / Joke Abandoned Project NoSQL	2012	Document / XML	Parody / Joke Abandoned Project NoSQL
MA	Manhattan	2014	—
	Manticore Search Search Engine	2017	Relational	Search Engine
	MapDB Abandoned Project	2012	Object-Oriented	Abandoned Project
	MapR-DB Acquired Company	2012	Column Family / Wide-Column	Acquired Company
	MarcelloDB Abandoned Project	2014	Object-Oriented	Abandoned Project
	MariaDB AI-Assisted	2009	Relational	AI-Assisted
	Mariposa	1994	Relational
	MarkLogic Acquired Company	2001	Document / XML, Triplestore / RDF	Acquired Company
	Marqo Search Engine AI-Assisted	2022	Document / XML, Vector	Search Engine AI-Assisted
	Materialize Streaming AI-Assisted	2019	Relational	Streaming AI-Assisted
	Matisse	1986	Document / XML
	MatrixOne OLAP OLTP Streaming AI-Assisted	2021	Relational	OLAP OLTP Streaming AI-Assisted
	MaxDB OLTP	1977	Relational	OLTP
MC	mcdb Abandoned Project Immutable MMAP	2010	Key/Value	Abandoned Project Immutable MMAP
	Mckoi SQL Database Abandoned Project Failed Company	1998	Relational	Abandoned Project Failed Company
MD	MDBM Abandoned Project	2012	Key/Value	Abandoned Project
MD	MDBMS	1998	Relational
	Meilisearch Search Engine AI-Assisted	2018	Document / XML	Search Engine AI-Assisted
	Memcached Cache	2003	Key/Value	Cache
	MemCP OLAP AI-Assisted	2022	Relational	OLAP AI-Assisted
	Memgraph AI-Assisted	2016	Graph	AI-Assisted
	Memstate Abandoned Project	2017	Object-Oriented	Abandoned Project
	Mentat Abandoned Project	2016	Relational	Abandoned Project
	MenteDB AI-Assisted	2026	Vector, Graph	AI-Assisted
	MetalBase Abandoned Project	—	Relational	Abandoned Project
	MillenniumDB Web Browser	2021	Graph, Triplestore / RDF	Web Browser
	Milvus Nearest Neighbor Search AI-Assisted	2019	Vector	Nearest Neighbor Search AI-Assisted
	Mimer SQL	1974	Relational
	Mimir Time-Series AI-Assisted	2016	Relational	Time-Series AI-Assisted
MK	mkdb	2023	Relational
	MLDB Acquired Company	2015	—	Acquired Company
MM	MMKV	2018	—
	Mnesia	—	Relational
	MobyDB	2026	Key/Value
MO	Model 204 Acquired Company	1965	Entity-Attribute-Value	Acquired Company
	ModeShape Abandoned Project	2008	Object-Oriented	Abandoned Project
	Mondrian OLAP Acquired Company	2002	Relational	OLAP Acquired Company
	MonetDB OLAP MMAP	2002	Column Family / Wide-Column	OLAP MMAP
	MongoDB NoSQL AI-Assisted	2009	Document / XML	NoSQL AI-Assisted
	Mongrel Serverless Failed Company	2021	Key/Value	Serverless Failed Company
	MonographDB	2021	Relational
	Monotone	2023	—
	MotherDuck Hosting Service	2022	Relational	Hosting Service
	mSQL	1994	Relational
MU	MUFFIN	1979	Relational
	Mulgara Abandoned Project	2006	Triplestore / RDF	Abandoned Project
	Multigres Middleware AI-Assisted	2025	Relational	Middleware AI-Assisted
MU	MuopDB	2024	—
MU	Mussel NewSQL	2022	Key/Value	NewSQL
	mutable	2019	—
	mvBase Acquired Company	—	Multi-Value	Acquired Company
	MyScaleDB OLAP Forked Code Failed Company AI-Assisted	2021	Relational	OLAP Forked Code Failed Company AI-Assisted
	MySQL Acquired Company	1994	Relational	Acquired Company
	NamiDB NoSQL	2026	Graph	NoSQL
NA	Nanolat Abandoned Project	2012	Key/Value	Abandoned Project
	Napa	2018	Relational
	NarayanaDB	2025	—
	NavDB Abandoned Project	2017	Key/Value, Relational	Abandoned Project
	NCache Cache	2015	Key/Value	Cache
	NDatabase	—	Object-Oriented
ND	NDB Cluster Acquired Company OLTP	—	Key/Value	Acquired Company OLTP
	Nebula Graph	2018	Graph
	NeDB Abandoned Project	2013	Document / XML	Abandoned Project
	NEO	2005	Document / XML
	Neo4j NoSQL AI-Assisted	2007	Graph	NoSQL AI-Assisted
	NeoDatis ODB Abandoned Project	2006	Object-Oriented	Abandoned Project
	Neon Serverless Forked Code Acquired Company OLTP	2021	Relational	Serverless Forked Code Acquired Company OLTP
NE	Neoview Abandoned Project	2007	Relational	Abandoned Project
	Neptune	2018	Graph, Triplestore / RDF
	nessDB Abandoned Project	2011	Key/Value	Abandoned Project
	Netezza OLAP Acquired Company	1999	Relational	OLAP Acquired Company
	Netlify Database Serverless Hosting Service	2024	Relational	Serverless Hosting Service
	Neug AI-Assisted	2026	Graph	AI-Assisted
	NeuroDB	2020	Graph
	NexusDB	2003	Relational
	Nile OLTP	2022	Relational	OLTP
	Ninja Database	—	Object-Oriented, Relational
	Nitrite NoSQL AI-Assisted	2017	Document / XML	NoSQL AI-Assisted
	NodeDB Multi-Model Nearest Neighbor Search AI-Assisted	2026	Vector, Graph, Array / Matrix, Document / XML, Relational	Multi-Model Nearest Neighbor Search AI-Assisted
	NoisePage	2018	Relational
	NoKV NoSQL AI-Assisted	2024	Key/Value	NoSQL AI-Assisted
	Noms Versioning Abandoned Project	2015	Document / XML	Versioning Abandoned Project
	NonStop SQL Acquired Company OLTP	1987	Relational	Acquired Company OLTP
	NornicDB Nearest Neighbor Search AI-Assisted	2025	Graph	Nearest Neighbor Search AI-Assisted
	NosDB Abandoned Project	2013	Document / XML	Abandoned Project
	NoSQL Object Database	1988	Object-Oriented
	nubmq Cache	2024	—	Cache
	NucliaDB Nearest Neighbor Search Search Engine	2021	Vector	Nearest Neighbor Search Search Engine
	NuDB Abandoned Project	2016	Key/Value	Abandoned Project
	Numstore Query Engine	2026	Array / Matrix	Query Engine
	NunDB	2018	Object-Oriented
	NuoDB NewSQL Acquired Company	2010	Relational	NewSQL Acquired Company
	NutsDB AI-Assisted	2018	Key/Value	AI-Assisted
	O2 Failed Company	1990	Object-Oriented	Failed Company
	OasysDB Nearest Neighbor Search	2023	Key/Value, Vector	Nearest Neighbor Search
	ObjectBox Time-Series Nearest Neighbor Search MMAP Mobile NoSQL	2016	Object-Oriented	Time-Series Nearest Neighbor Search MMAP Mobile NoSQL
	ObjectDatabase++	2003	Object-Oriented
	ObjectDB	2010	Object-Oriented
	Objectivity/DB	1990	Object-Oriented
	ObjectStore Acquired Company	1988	Object-Oriented	Acquired Company
	ObsessionDB OLAP Hosting Service	2024	Relational	OLAP Hosting Service
	OceanBase	2010	Relational
	Ocelot Failed Company	2001	Relational	Failed Company
	Ocient	2016	Relational
	OctaneDB Nearest Neighbor Search	2025	Vector	Nearest Neighbor Search
	OctopusDB	2010	—
	OctoSQL Query Engine Abandoned Project	2019	Relational	Query Engine Abandoned Project
	ODABA	1994	Object-Oriented
	OlegDB MMAP NoSQL	2014	Key/Value	MMAP NoSQL
	OnceDB Cache Abandoned Project Failed Company	2016	Document / XML	Cache Abandoned Project Failed Company
	OneDB	2020	Relational
	OpenBase SQL Failed Company	1991	Relational	Failed Company
	OpenEdge OLTP	1984	Relational	OLTP
	openGemini Time-Series AI-Assisted	2022	Relational	Time-Series AI-Assisted
OP	open-gpdb OLAP Forked Code	2024	Relational	OLAP Forked Code
	OpenMLDB	2017	Relational
	OpenQM Acquired Company	1993	Multi-Value	Acquired Company
	OpenSearch Forked Code Search Engine AI-Assisted	2021	Document / XML	Forked Code Search Engine AI-Assisted
	OpenTSDB Time-Series	2010	Key/Value	Time-Series
	OpenViking AI-Assisted	2026	—	AI-Assisted
	Opteryx OLAP Serverless AI-Assisted	2021	Relational	OLAP Serverless AI-Assisted
	Oracle NoSQL NoSQL	2011	Key/Value	NoSQL
	Oracle RDBMS	1977	Key/Value, Graph, Triplestore / RDF, Document / XML, Relational
	OrbitDB Peer-to-Peer	2015	Document / XML, Key/Value	Peer-to-Peer
	OrientDB Multi-Model Acquired Company NoSQL	2010	Document / XML, Graph, Key/Value, Object-Oriented	Multi-Model Acquired Company NoSQL
	OrigoDB Abandoned Project	2011	Key/Value, Graph, Object-Oriented, Document / XML, Relational	Abandoned Project
	OrioleDB Acquired Company AI-Assisted	2021	Relational	Acquired Company AI-Assisted
OS	OSIsoft PI	—	—
	OushuDB	2016	Relational
	Ovrimos Failed Company	1996	—	Failed Company
	Oxia AI-Assisted	2021	Key/Value	AI-Assisted
	OxidSQL	2022	Relational
	Oxigraph	2018	Graph, Triplestore / RDF
	Oxla OLAP Acquired Company	2020	Relational	OLAP Acquired Company
	Pail Peer-to-Peer	2022	Key/Value	Peer-to-Peer
PA	PalDB Abandoned Project	2015	Key/Value	Abandoned Project
	PancakeDB	2021	—
	Paper Abandoned Project NoSQL	2015	Key/Value, Object-Oriented	Abandoned Project NoSQL
	ParAccel OLAP Acquired Company	2006	Relational	OLAP Acquired Company
	ParadeDB OLAP Nearest Neighbor Search Search Engine AI-Assisted	2023	Relational	OLAP Nearest Neighbor Search Search Engine AI-Assisted
PA	Paradise	1994	Object-Oriented
	Paradox Acquired Company	1985	Relational	Acquired Company
	ParStream OLAP Acquired Company Abandoned Project	2010	Relational	OLAP Acquired Company Abandoned Project
PE	PearlDB Abandoned Project	2015	Key/Value	Abandoned Project
	Pebble AI-Assisted	2018	Key/Value	AI-Assisted
	Percona Server Forked Code	2006	Relational	Forked Code
	Perst Acquired Company	2003	Object-Oriented	Acquired Company
	Pervasive PSQL Acquired Company	1996	Key/Value, Relational	Acquired Company
PE	Peterlee Relational Test Vehicle	1970	Relational
	Phoenix Middleware	2014	Relational	Middleware
	PhotonDB Abandoned Project	2022	Key/Value	Abandoned Project
	pickleDB	2011	Document / XML
PI	PicoDB Abandoned Project	2016	Document / XML	Abandoned Project
	picoSQL Abandoned Project	1995	Relational	Abandoned Project
	PieCloudDB OLAP	2021	Relational	OLAP
	Pika AI-Assisted	2014	Key/Value	AI-Assisted
	piladb Abandoned Project	2015	Object-Oriented	Abandoned Project
	Pilosa Abandoned Project	2017	Vector	Abandoned Project
	Pincaster	2010	Document / XML
	Pinecone Nearest Neighbor Search Search Engine	2019	Vector	Nearest Neighbor Search Search Engine
	Pinot OLAP AI-Assisted	2014	Relational	OLAP AI-Assisted
	PinusDB Abandoned Project	2019	Relational	Abandoned Project
	PipelineDB Acquired Company Abandoned Project Streaming	2013	Relational	Acquired Company Abandoned Project Streaming
	PlanetScale Forked Code OLTP	2018	Relational	Forked Code OLTP
PN	PNUTS Abandoned Project OLTP NoSQL	2008	Key/Value	Abandoned Project OLTP NoSQL
	PocketBase	2022	Relational
	pocketSQL Abandoned Project	2001	Relational	Abandoned Project
	Pogocache Cache	2025	Key/Value	Cache
	Pogreb MMAP	2018	Key/Value	MMAP
	PointBase Acquired Company	1998	Relational	Acquired Company
	PolarDB	2017	Relational
	Polars Query Engine AI-Assisted	2020	—	Query Engine AI-Assisted
	PoloDB NoSQL	2020	Document / XML	NoSQL
	Polybase Blockchain	2022	Document / XML	Blockchain
	Polyhedra Acquired Company	1994	Relational	Acquired Company
	Polypheny	2017	Document / XML, Graph, Relational
	PosDB OLAP	2017	Relational	OLAP
	PostgreSQL OLTP	1986	Relational	OLTP
	PouchDB Web Browser NoSQL	2010	Document / XML	Web Browser NoSQL
PR	PranaDB Abandoned Project	2022	Relational	Abandoned Project
	Predator	1996	Relational
	PrestoDB OLAP AI-Assisted	2013	Document / XML, Key/Value, Column Family / Wide-Column, Relational	OLAP AI-Assisted
	PrimeBase OLTP	1990	Relational	OLTP
PR	PRISMA	1986	Relational
	ProfaneDB Abandoned Project	2017	Object-Oriented	Abandoned Project
	Prometheus Time-Series AI-Assisted	2012	Key/Value	Time-Series AI-Assisted
	Proteus	2015	Relational
	Proton Streaming AI-Assisted	2021	Relational	Streaming AI-Assisted
	ProtonBase OLAP	2021	Document / XML, Relational	OLAP
	ProvenDB Acquired Company Blockchain Middleware	2018	Document / XML	Acquired Company Blockchain Middleware
	P*TIME Acquired Company OLTP	2000	Relational	Acquired Company OLTP
	PuffinDB Serverless Abandoned Project	2023	Relational	Serverless Abandoned Project
	PumpkinDB Abandoned Project Immutable	2017	Key/Value	Abandoned Project Immutable
	PupDB Abandoned Project	2019	Key/Value	Abandoned Project
	PysonDB Abandoned Project NoSQL	2020	Document / XML	Abandoned Project NoSQL
	Qdrant Nearest Neighbor Search Search Engine MMAP AI-Assisted	2020	Vector	Nearest Neighbor Search Search Engine MMAP AI-Assisted
	qikkDB OLAP Abandoned Project Failed Company	2019	Relational	OLAP Abandoned Project Failed Company
	Qizx Acquired Company	2004	Document / XML	Acquired Company
	ql	2013	Relational
	QLDB Abandoned Project Blockchain	2018	Document / XML	Abandoned Project Blockchain
	qlever	2014	—
	Qserv AI-Assisted	2011	Relational	AI-Assisted
	Quadcap Embeddable Database Failed Company	1999	Relational	Failed Company
	Quadrable Abandoned Project	2020	Key/Value	Abandoned Project
	quasardb	2008	Key/Value
	QuestDB Time-Series AI-Assisted	2014	Relational	Time-Series AI-Assisted
QU	Quickbase	—	—
	Quickstep OLAP Abandoned Project	2013	Relational	OLAP Abandoned Project
	Quickwit Acquired Company Search Engine AI-Assisted	2021	Document / XML	Acquired Company Search Engine AI-Assisted
	QuineDB	2016	Key/Value
	Quokka OLAP Abandoned Project	2021	Relational	OLAP Abandoned Project
	RadonDB Abandoned Project Failed Company	2018	Relational	Abandoned Project Failed Company
	RageDB Abandoned Project	2021	Graph	Abandoned Project
	RaimaDB Time-Series	1984	Network, Relational	Time-Series
	RainStor Acquired Company	2004	Relational	Acquired Company
	RamSQL	2014	Relational
	Raphtory OLAP AI-Assisted	2020	Graph	OLAP AI-Assisted
	RapidsDB OLAP Middleware	2014	—	OLAP Middleware
	RaptorDB Forked Code	2024	Relational	Forked Code
	RaptorDB Abandoned Project	2012	Document / XML	Abandoned Project
	Rasdaman	1989	Array / Matrix
	RavenDB MMAP NoSQL AI-Assisted	2009	Document / XML, Key/Value	MMAP NoSQL AI-Assisted
	RayforceDB OLAP AI-Assisted	2023	Relational	OLAP AI-Assisted
	R:BASE	1981	Relational
	/rdb Abandoned Project	1984	Relational	Abandoned Project
RD	RDBMS	1974	Relational
	Rdb/VMS Acquired Company	1984	Relational	Acquired Company
	RDFox	—	Triplestore / RDF
	ReadySet Cache Middleware AI-Assisted	2020	Relational	Cache Middleware AI-Assisted
	Reality Acquired Company	1973	—	Acquired Company
	Realm Acquired Company Abandoned Project Mobile	2011	Object-Oriented	Acquired Company Abandoned Project Mobile
	redb OLTP AI-Assisted	2018	Key/Value	OLTP AI-Assisted
	Red Brick OLAP Acquired Company	1990	Relational	OLAP Acquired Company
	Redcon	2016	Key/Value
	RedDatabase Forked Code	2006	Relational	Forked Code
	Redict Cache Forked Code NoSQL	2024	Key/Value	Cache Forked Code NoSQL
	Redis Cache OLTP AI-Assisted	2009	Key/Value	Cache OLTP AI-Assisted
	RedisGraph	2018	Graph
	RediSQL Abandoned Project	2016	Relational	Abandoned Project
	RedixDB Abandoned Project	2018	Key/Value	Abandoned Project
	RedoxQL	2024	—
	Redshift OLAP Serverless	2012	Relational	OLAP Serverless
	RedStore Abandoned Project	2009	Triplestore / RDF	Abandoned Project
	ReductStore Time-Series AI-Assisted	2021	Key/Value	Time-Series AI-Assisted
	Redwood Abandoned Project Peer-to-Peer	2019	Key/Value	Abandoned Project Peer-to-Peer
RE	RefineDB Abandoned Project	2021	Document / XML	Abandoned Project
	Regatta OLAP OLTP	2020	Relational	OLAP OLTP
	ReifyDB OLTP	2025	Relational	OLTP
	Rel	2004	Relational
	RelationalAI	2018	Graph, Relational
	RelationalCloud	2010	Relational
	Relational Database Service Hosting Service	2009	—	Hosting Service
RE	Relatude.DB	2025	Graph, Object-Oriented
	Relaxo Abandoned Project	2012	Document / XML	Abandoned Project
	ResilientDB Blockchain	2019	Document / XML	Blockchain
	Resin Cache Cache Middleware	1998	Key/Value	Cache Middleware
	RethinkDB Failed Company NoSQL	2009	Document / XML	Failed Company NoSQL
	RexDB Acquired Company	2006	Relational	Acquired Company
	RhizomeDB Abandoned Project Peer-to-Peer	2022	Relational	Abandoned Project Peer-to-Peer
	Riak Abandoned Project Failed Company NoSQL	2010	Key/Value	Abandoned Project Failed Company NoSQL
RI	Riffle Abandoned Project Immutable	2014	—	Abandoned Project Immutable
	RisingLight	2021	Relational
	RisingWave Streaming AI-Assisted	2021	Relational	Streaming AI-Assisted
	Rockall-DB	—	—
	RocksDB Forked Code OLTP	2012	Key/Value	Forked Code OLTP
	Rockset OLAP Acquired Company	2016	Relational	OLAP Acquired Company
	ROMA Abandoned Project	2009	Key/Value	Abandoned Project
	RonDB OLTP AI-Assisted	2020	Key/Value, Relational	OLTP AI-Assisted
	Rosebase Failed Company	1992	Relational	Failed Company
	RoseDB NoSQL AI-Assisted	2020	Key/Value	NoSQL AI-Assisted
	rqlite AI-Assisted	2014	Relational	AI-Assisted
	RubatoDB	2014	Key/Value
	RudraDB Nearest Neighbor Search	2025	Document / XML, Vector	Nearest Neighbor Search
	RxDB AI-Assisted	2016	Document / XML	AI-Assisted
	Rya Abandoned Project Middleware NoSQL	2012	Triplestore / RDF	Abandoned Project Middleware NoSQL
	SableDb Cache NoSQL	2024	Key/Value	Cache NoSQL
	Sadas Engine	—	Relational
SA	Salvobase AI-Assisted	2026	—	AI-Assisted
SA	Sanakirja	—	—
	SapphireDb Abandoned Project	2018	Object-Oriented	Abandoned Project
	Satori	2025	—
SB	sboxdb	2024	—
	ScalarDB	—	—
	Scalaris Abandoned Project	—	Key/Value	Abandoned Project
	ScaleBase Acquired Company	2009	—	Acquired Company
	ScaleDB Failed Company	2005	—	Failed Company
	ScaleOut StateServer	2005	Key/Value
	ScalienDB Abandoned Project Failed Company	2010	Key/Value	Abandoned Project Failed Company
	SchemafreeSQL	2012	Document / XML
	SchemaJS	2024	—
	SchoonerSQL Acquired Company OLTP	2007	Relational	Acquired Company OLTP
	SciDB OLAP	2008	Array / Matrix	OLAP
	ScimoreDB	2005	Relational
	ScopeDB	2024	Relational
	ScratchDB OLAP Middleware	2023	Document / XML	OLAP Middleware
	Scuba	2013	Relational
	Scylla NoSQL AI-Assisted	2014	Key/Value, Column Family / Wide-Column	NoSQL AI-Assisted
SD	SDB	—	Document / XML, Relational
SD	SDD-1	—	—
	Seafowl OLAP Acquired Company	2022	Relational	OLAP Acquired Company
	SearchBlox Search Engine	2003	Document / XML	Search Engine
	Sedna Abandoned Project	2003	Document / XML	Abandoned Project
	SeekDB AI-Assisted	2025	—	AI-Assisted
	SenseiDB Abandoned Project	2012	Relational	Abandoned Project
	Sequins Abandoned Project	2014	Key/Value	Abandoned Project
	SequoiaDB	2011	Document / XML
	SereneDB OLAP OLTP Search Engine AI-Assisted	2024	Relational	OLAP OLTP Search Engine AI-Assisted
	Serenity Abandoned Project NoSQL	2015	—	Abandoned Project NoSQL
	Sesame	1997	Triplestore / RDF
	ShannonBase	2024	Relational, Vector
	ShardingSphere AI-Assisted	2016	Relational	AI-Assisted
	ShareBase Acquired Company	1979	—	Acquired Company
SH	SharedDB	2012	Relational
SH	Shore Abandoned Project OLTP	1995	Object-Oriented	Abandoned Project OLTP
SH	Shore-MT Forked Code OLTP	2007	Object-Oriented	Forked Code OLTP
	shsql	2002	Relational
	Siaqodb Abandoned Project Failed Company NoSQL	—	Document / XML	Abandoned Project Failed Company NoSQL
	SignalDB NoSQL AI-Assisted	2023	Document / XML	NoSQL AI-Assisted
SI	Silo Abandoned Project	2013	Relational	Abandoned Project
	SimpleDB NoSQL	2007	Key/Value	NoSQL
	SingleStore OLAP NewSQL Acquired Company OLTP	2011	Document / XML, Key/Value, Multi-Value, Object-Oriented, Relational, Vector	OLAP NewSQL Acquired Company OLTP
	Siodb Abandoned Project	2018	Relational	Abandoned Project
	Sir.DB Abandoned Project	2020	Document / XML	Abandoned Project
	SiriDB Time-Series	2016	—	Time-Series
	Sirius OLAP Query Engine AI-Assisted	2024	Relational	OLAP Query Engine AI-Assisted
	SirixDB AI-Assisted	2012	Document / XML	AI-Assisted
	SKDB OLTP AI-Assisted	2022	Relational	OLTP AI-Assisted
	Skeg Multi-Model	2026	—	Multi-Model
SK	SkeletonDB Abandoned Project	2016	—	Abandoned Project
	Sklad NoSQL	2024	Key/Value	NoSQL
	SKSQL Abandoned Project	2021	Relational	Abandoned Project
SK	SkyDB	2013	—
	Skyrise OLAP Serverless Query Engine	2019	Relational	OLAP Serverless Query Engine
	Skytable NoSQL	2020	Key/Value	NoSQL
	SlateDB AI-Assisted	2024	Key/Value	AI-Assisted
	Sled	2016	Key/Value
	SleekDB	2018	Document / XML
	SlicingDice Failed Company	2015	—	Failed Company
	SlothDB	2026	Relational
SL	Slumber DB Abandoned Project	2014	Key/Value	Abandoned Project
	SlyceIO	2023	Document / XML
	SmallSQL Abandoned Project	2005	Relational	Abandoned Project
SM	SmithDB OLAP	2026	—	OLAP
	Sneller	2022	Document / XML
	Snowflake OLAP	2013	Document / XML, Relational	OLAP
	SochDB AI-Assisted	2026	Graph, Relational, Vector	AI-Assisted
	SolarSystemDB Serverless Failed Company	2024	—	Serverless Failed Company
	solidDB Acquired Company OLTP	1992	Relational	Acquired Company OLTP
	SoloDB	2024	—
	Solr Search Engine NoSQL AI-Assisted	2004	Document / XML	Search Engine NoSQL AI-Assisted
	sones GraphDB Abandoned Project Failed Company	2007	Graph	Abandoned Project Failed Company
SO	Sonnerie Time-Series	—	Relational	Time-Series
	Sophia	—	—
	SpaceTime	2020	Relational
	SpacetimeDB OLTP AI-Assisted	2023	Relational	OLTP AI-Assisted
SP	Sparkey Abandoned Project Immutable	2013	Key/Value	Abandoned Project Immutable
	SparkleDB OLTP	2013	Graph	OLTP
	Sparksee	2006	Graph, Object-Oriented
	Spark SQL OLAP AI-Assisted	2014	—	OLAP AI-Assisted
	SparrowDB AI-Assisted	2026	Graph	AI-Assisted
	SparrowDB Abandoned Project	2016	Key/Value	Abandoned Project
	Speedb Forked Code Acquired Company	2020	Key/Value	Forked Code Acquired Company
	Speedy Abandoned Project	—	Relational	Abandoned Project
	Sphinx Search Engine	2001	Document / XML	Search Engine
	SpiceDB Middleware AI-Assisted	2021	Object-Oriented	Middleware AI-Assisted
	Splice Machine Abandoned Project Failed Company	2012	—	Abandoned Project Failed Company
	SplinterDB NoSQL	2018	Key/Value	NoSQL
	Splunk Acquired Company Search Engine	2002	Key/Value	Acquired Company Search Engine
	SpreadsheetDB Failed Company	2017	Document / XML	Failed Company
	SQL Anywhere Acquired Company	1992	Relational	Acquired Company
	SQLBase Acquired Company	1984	Relational	Acquired Company
SQ	SQL/DS	1981	Relational
	SQLflex	—	Relational
	SQLite OLTP	2000	Relational	OLTP
	SQLite.Cloud OLTP Hosting Service	2020	Relational	OLTP Hosting Service
	SQL Server	1988	Relational
	SQream OLAP	2010	Relational	OLAP
	Sqrrl Acquired Company NoSQL	2012	Graph, Key/Value	Acquired Company NoSQL
SQ	Squirreling Query Engine Web Browser AI-Assisted	2025	Relational	Query Engine Web Browser AI-Assisted
	SRCH² Abandoned Project	2010	—	Abandoned Project
	SSDB Abandoned Project	2013	Key/Value	Abandoned Project
	Starcounter	2006	—
	Stardog	2005	Triplestore / RDF
	StarRocks OLAP AI-Assisted	2021	Relational, Column Family / Wide-Column	OLAP AI-Assisted
	Starskey OLTP	2025	Key/Value	OLTP
	StellarSQL Abandoned Project	2018	Relational	Abandoned Project
	StereoDB OLTP	2023	Relational	OLTP
	Stig Abandoned Project Failed Company	2010	Graph	Abandoned Project Failed Company
	StoneDB OLAP Failed Company	2022	Relational	OLAP Failed Company
	Stoolap OLAP OLTP	2025	Relational	OLAP OLTP
	StormDB Acquired Company	2012	Relational	Acquired Company
ST	StormiDB NoSQL	2024	Document / XML	NoSQL
	Strabon	2011	Triplestore / RDF
	Streambase Acquired Company Streaming	2003	—	Acquired Company Streaming
	StrixDB	—	Triplestore / RDF
	Strozzi NoSQL	1989	Relational
	STSdb Failed Company	2008	Key/Value	Failed Company
	SummitDB Abandoned Project NoSQL	2016	Key/Value	Abandoned Project NoSQL
	Supabase OLTP AI-Assisted Hosting Service	2020	—	OLTP AI-Assisted Hosting Service
	Superbase	1983	Relational
	Supra Server SQL Acquired Company OLTP	1989	Relational	Acquired Company OLTP
	SurrealDB Serverless Multi-Model AI-Assisted	2016	Document / XML, Graph, Relational	Serverless Multi-Model AI-Assisted
	Swarm64 OLAP Acquired Company	2013	Relational	OLAP Acquired Company
	SwarnDB	2025	—
	SwayDB Abandoned Project	2018	Key/Value	Abandoned Project
	SWC-DB Abandoned Project	2019	Column Family / Wide-Column, Key/Value	Abandoned Project
	SwellDB AI-Assisted	2025	Relational	AI-Assisted
	Swytch Cache	2023	Key/Value	Cache
	SylvaDB Abandoned Project	2009	Graph	Abandoned Project
SY	SylvieJS Web Browser	2023	Document / XML	Web Browser
	SynapCores	2026	—
	System G	2009	Graph
SY	System R OLTP	1972	Relational	OLTP
	TabDB Parody / Joke Abandoned Project	2019	Relational	Parody / Joke Abandoned Project
	Tablespace	2024	—
	TaffyDB Abandoned Project	2009	Document / XML	Abandoned Project
	Tajo OLAP Abandoned Project	2012	Relational	OLAP Abandoned Project
	Tamino	2000	Document / XML
	Tantivy Search Engine MMAP AI-Assisted	2016	Document / XML	Search Engine MMAP AI-Assisted
	Tanzu GemFire Cache Acquired Company NoSQL	2002	Key/Value	Cache Acquired Company NoSQL
	Tarantool	2008	Key/Value
	TayzGrid	—	Object-Oriented
	Tdbengine	1985	Relational
	TDbf xBase	—	—	xBase
	TDengine Time-Series AI-Assisted	2017	Relational	Time-Series AI-Assisted
	TDSQL	2012	Key/Value, Document / XML, Relational
	Tendis NoSQL	2018	Key/Value	NoSQL
	TensorBase OLAP Abandoned Project Failed Company	2020	Relational	OLAP Abandoned Project Failed Company
TE	Tera Abandoned Project	2014	Column Family / Wide-Column	Abandoned Project
	Teradata	1979	Document / XML, Graph, Relational
	TerarkDB Forked Code Acquired Company	2016	Key/Value	Forked Code Acquired Company
	TerminusDB AI-Assisted	2019	Document / XML, Graph, Triplestore / RDF	AI-Assisted
	Terrastore Abandoned Project	2009	Document / XML	Abandoned Project
	Tesora Acquired Company Middleware	2010	Relational	Acquired Company Middleware
	Theseus OLAP Failed Company	2022	Relational	OLAP Failed Company
	ThinkSQL Abandoned Project	2000	Relational	Abandoned Project
	ThreadDB Abandoned Project Peer-to-Peer	2019	Document / XML	Abandoned Project Peer-to-Peer
	ThruDB	2006	—
	Tibero OLTP	2003	Relational	OLTP
	TiDB NewSQL AI-Assisted	2015	Key/Value	NewSQL AI-Assisted
	TidesDB OLTP	2024	Column Family / Wide-Column	OLTP
	tiedot Abandoned Project	2013	Document / XML	Abandoned Project
	TieredMemDB Cache Forked Code Abandoned Project NoSQL	2020	Key/Value	Cache Forked Code Abandoned Project NoSQL
	TigerBeetle	2020	Relational
	TigerGraph	2012	Graph
	TiKV AI-Assisted	2016	Key/Value	AI-Assisted
	Tile38	2016	—
	TileDB NoSQL	2014	Array / Matrix	NoSQL
	Timbala Time-Series Abandoned Project	2016	Relational	Time-Series Abandoned Project
	TIMBER	—	Document / XML
	TimescaleDB Time-Series AI-Assisted	2017	Relational	Time-Series AI-Assisted
	TimesTen Acquired Company OLTP	1996	Relational	Acquired Company OLTP
	Timestream	2018	Relational
	TingoDB Abandoned Project	2013	Document / XML	Abandoned Project
	TinyBase	2021	Relational
	Tinybird	2019	—
	TinyDB Query Engine Peer-to-Peer	1999	Relational	Query Engine Peer-to-Peer
	TinyDB	2013	Document / XML
TI	tinySQL	2003	—
	Titan Acquired Company Abandoned Project	2012	Graph	Acquired Company Abandoned Project
TI	Titan Abandoned Project	2018	—	Abandoned Project
	Tkrzw DBM	2020	Key/Value	DBM
	TokuDB Acquired Company Abandoned Project	2009	Relational	Acquired Company Abandoned Project
	TokuMX Forked Code Acquired Company Abandoned Project	2013	Document / XML	Forked Code Acquired Company Abandoned Project
	Tokyo Cabinet	2006	Key/Value
TO	Tokyo Tyrant	—	—
	TomP2P Abandoned Project	2004	Key/Value	Abandoned Project
	Tonbo OLTP AI-Assisted	2024	Key/Value	OLTP AI-Assisted
	TonicDB OLTP	2025	Key/Value	OLTP
	TopK Nearest Neighbor Search Search Engine AI-Assisted	2024	Document / XML	Nearest Neighbor Search Search Engine AI-Assisted
	ToplingDB Forked Code AI-Assisted	2021	Key/Value	Forked Code AI-Assisted
	ToroDB Abandoned Project	—	Document / XML	Abandoned Project
TO	TOTAL	—	—
	toyDB	2019	Relational
	Trafodion Abandoned Project	2014	Column Family / Wide-Column	Abandoned Project
	TrailDB Abandoned Project	2014	Relational	Abandoned Project
	Transbase	1987	Relational
	TransLattice NewSQL Failed Company	2007	—	NewSQL Failed Company
TR	Traverse	—	—
	TreodeDB Abandoned Project	2012	Key/Value	Abandoned Project
	Trino AI-Assisted	2019	—	AI-Assisted
	Trousseau	2013	Key/Value
	Truviso Acquired Company Streaming	2006	Relational	Acquired Company Streaming
	tsink Time-Series	2025	—	Time-Series
	ts-sql Abandoned Project	2020	Relational	Abandoned Project
	TuGraph	2021	Graph
	TukDB Search Engine	2024	Document / XML	Search Engine
TU	TurboImage	1972	—
	turbopuffer Serverless Nearest Neighbor Search	2023	Vector	Serverless Nearest Neighbor Search
	Turso OLTP AI-Assisted	2023	Relational	OLTP AI-Assisted
	Twig	2009	Object-Oriented
	TypeDB AI-Assisted	2016	Entity-Relationship, Graph	AI-Assisted
TY	Typhon AI-Assisted	2015	—	AI-Assisted
TY	Typhoon Abandoned Project	1996	Relational	Abandoned Project
	UDS/SQL	—	Network
	Ultipa OLAP OLTP NoSQL	2019	Graph	OLAP OLTP NoSQL
	Ultralite	1999	Relational
	Umbra OLAP OLTP	2018	Array / Matrix, Relational	OLAP OLTP
	Unbounded Failed Company	2020	Document / XML	Failed Company
UN	Unify	—	—
	UnisonDB Multi-Model	2025	Column Family / Wide-Column, Key/Value	Multi-Model
	UniSQL Acquired Company	1991	Relational	Acquired Company
UN	UniVerse Acquired Company	1990	—	Acquired Company
	UnQLite OLTP NoSQL	—	Document / XML, Key/Value	OLTP NoSQL
	UnumDB Abandoned Project Failed Company	2015	Document / XML, Graph, Key/Value, Array / Matrix	Abandoned Project Failed Company
	upscaledb OLAP Abandoned Project	2007	Key/Value	OLAP Abandoned Project
	Vald Nearest Neighbor Search Search Engine AI-Assisted	2019	Vector	Nearest Neighbor Search Search Engine AI-Assisted
	Valentina Database OLTP	1998	Relational	OLTP
	Valkey Cache Forked Code NoSQL AI-Assisted	2024	Key/Value	Cache Forked Code NoSQL AI-Assisted
VA	Valthree	2025	—
	VanillaDB Abandoned Project	2016	Multi-Value	Abandoned Project
	Vearch Nearest Neighbor Search Search Engine	2019	Document / XML, Vector	Nearest Neighbor Search Search Engine
VE	vecdb Nearest Neighbor Search Search Engine MMAP	2026	Document / XML, Vector	Nearest Neighbor Search Search Engine MMAP
	Vector OLAP Acquired Company	2009	Relational	OLAP Acquired Company
	VectorDB Nearest Neighbor Search	2023	Document / XML, Vector	Nearest Neighbor Search
	VectorDB Abandoned Project Nearest Neighbor Search	2023	Document / XML, Vector	Abandoned Project Nearest Neighbor Search
	VectorSQL OLAP Abandoned Project	2020	Relational	OLAP Abandoned Project
	Vedis Abandoned Project	2014	Key/Value	Abandoned Project
	VelarixDB	2024	Key/Value
	VelocityDB Abandoned Project	2011	Object-Oriented	Abandoned Project
	Velox OLAP Query Engine AI-Assisted	2020	Relational	OLAP Query Engine AI-Assisted
	VeloxDB OLTP	2022	Object-Oriented	OLTP
	Venice AI-Assisted	2014	Document / XML	AI-Assisted
	VennDB	2023	Relational
	VertexDB Abandoned Project	2009	Graph	Abandoned Project
	Vertica OLAP Forked Code Acquired Company	2005	Relational	OLAP Forked Code Acquired Company
	Vespa Search Engine AI-Assisted	1997	Document / XML	Search Engine AI-Assisted
	vFabric SQLFire	—	—
	VictoriaMetrics Time-Series AI-Assisted	2018	Column Family / Wide-Column	Time-Series AI-Assisted
	VillageSQL Forked Code OLTP Revival Project AI-Assisted	2025	Relational	Forked Code OLTP Revival Project AI-Assisted
	Virtuoso	1998	Relational
	VistaDB	2009	—
	Visual FoxPro xBase	1992	Relational	xBase
	Vitess Middleware AI-Assisted	2011	Relational	Middleware AI-Assisted
	Vitesse DB OLAP	2014	Relational	OLAP
	ViyaDB OLAP Abandoned Project	2017	Relational	OLAP Abandoned Project
	voidDB OLTP MMAP	2024	Key/Value	OLTP MMAP
	Voldemort Abandoned Project NoSQL	2009	Key/Value	Abandoned Project NoSQL
	VoltDB NewSQL	2009	Relational	NewSQL
VS	vsql	2021	Relational
VU	VulcanDB Failed Company	2012	Object-Oriented	Failed Company
	vyhodb Abandoned Project	2012	Network	Abandoned Project
	WakandaDB Failed Company	1996	Document / XML	Failed Company
	WarehousePG Forked Code AI-Assisted	2025	Relational	Forked Code AI-Assisted
	Warp 10 Time-Series	2013	—	Time-Series
	Weaviate Nearest Neighbor Search Search Engine MMAP AI-Assisted	2016	Vector	Nearest Neighbor Search Search Engine MMAP AI-Assisted
	WebScaleSQL Forked Code Abandoned Project	2014	Relational	Forked Code Abandoned Project
WE	WebSphere eXtreme Scale	—	Object-Oriented
	WhiteDB Abandoned Project	2008	Network	Abandoned Project
	WiredTiger Acquired Company AI-Assisted	2008	Key/Value	Acquired Company AI-Assisted
	WonderDB Abandoned Project OLTP	2013	Relational	Abandoned Project OLTP
	XAP	2000	Key/Value
	Xapian Search Engine	2001	Document / XML	Search Engine
	Xata Forked Code AI-Assisted	2020	Relational	Forked Code AI-Assisted
XD	XDB Enterprise Server Acquired Company	1998	Relational	Acquired Company
	Xeround Failed Company Hosting Service	2005	Relational	Failed Company Hosting Service
	Xodus	2014	Document / XML
XP	XPRS	1988	—
	XTDB AI-Assisted	2018	Document / XML	AI-Assisted
	XtremeData OLAP	2003	Relational	OLAP
	Yaacomo OLAP Failed Company	2008	Relational	OLAP Failed Company
	YantrikDB AI-Assisted	2026	—	AI-Assisted
	Yanza Time-Series Failed Company	2008	Document / XML	Time-Series Failed Company
	YaraDB	2025	Document / XML
	YARD-SQL Failed Company	1996	Relational	Failed Company
	YDB NewSQL OLTP AI-Assisted	2014	Relational	NewSQL OLTP AI-Assisted
	Yellowbrick OLAP	2014	Relational	OLAP
	YottaDB NoSQL	2001	Key/Value	NoSQL
	YouTrackDB Forked Code AI-Assisted	2024	Graph	Forked Code AI-Assisted
	YTsaurus AI-Assisted	2010	—	AI-Assisted
	YugabyteDB Forked Code OLTP AI-Assisted	2016	Key/Value, Relational	Forked Code OLTP AI-Assisted
	zeeSQL	—	—
	Zentropy	2025	Key/Value
	ZeptoDB Time-Series AI-Assisted	2026	—	Time-Series AI-Assisted
	ZeroDB Abandoned Project	2015	Document / XML	Abandoned Project
	ZippyDB Cache Serverless Failed Company	2014	Key/Value	Cache Serverless Failed Company
	ZippyDB	2013	Key/Value
	ZODB	2002	Object-Oriented
	ZooDB Abandoned Project	2008	Object-Oriented	Abandoned Project
	Zookeeper	2008	Hierarchical
	Zu Cache	2025	Key/Value	Cache
	Zvec	—	—