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	AceDB Abandoned	1989	—	Abandoned
	ActorDB Abandoned	2014	Relational	Abandoned
AG	AgateDB Abandoned	2019	Key/Value	Abandoned
	AGEDB Middleware AI-Assisted	2019	Graph	Middleware AI-Assisted
	AionDB Multi-Model	2026	Graph, Relational, Vector	Multi-Model
	AKDB	2009	Relational
AL	AlchemyDB Acquired Company Abandoned	2010	Relational	Acquired Company Abandoned
	AllocDB	2026	Relational
	AlloyDB OLAP Forked Code OLTP	2022	Relational	OLAP Forked Code OLTP
AL	allydb	2025	—
	AncelusDB	1983	Entity-Relationship
AN	AngstromDB Abandoned	2013	Key/Value	Abandoned
	AnnaDB Abandoned NoSQL	2021	Document / XML	Abandoned NoSQL
	AnnDB Nearest Neighbor Search	2020	Vector	Nearest Neighbor Search
	AntDB Forked Code	—	Relational	Forked Code
AN	AnuDB Serverless NoSQL	2025	Document / XML	Serverless NoSQL
AO	AODBM Abandoned	2011	—	Abandoned
	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	2013	Key/Value	Abandoned
	AresDB OLAP Abandoned	2018	Relational	OLAP Abandoned
	AsterixDB OLAP AI-Assisted	2009	Document / XML	OLAP AI-Assisted
	AtomicDB Failed Company	2011	Object-Oriented	Failed Company
	AverageDB Parody / Joke	2024	Document / XML	Parody / Joke
	AvionDB Abandoned Peer-to-Peer	2020	Document / XML	Abandoned Peer-to-Peer
	AwaDB Abandoned Nearest Neighbor Search	2023	Document / XML, Vector	Abandoned Nearest Neighbor Search
	Azure HorizonDB	2026	Relational
	BabuDB Abandoned	2008	Key/Value	Abandoned
	BadgerDB AI-Assisted	2017	Key/Value	AI-Assisted
	BagelDB	2023	Vector
	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	—
	BayesDB Abandoned	2015	—	Abandoned
	BBoxDB AI-Assisted	2015	Array / Matrix	AI-Assisted
	BemiDB	2024	Relational
	BergDB	2013	Document / XML
	Berkeley DB Acquired Company OLTP DBM	1994	Document / XML, Key/Value	Acquired Company OLTP DBM
	BerylDB	2021	Key/Value
	BigchainDB Abandoned Blockchain	2015	Document / XML, Key/Value	Abandoned Blockchain
	BlinkDB Abandoned	2012	Relational	Abandoned
	BoltDB Abandoned	2013	Key/Value	Abandoned
	BonsaiDb	2021	Key/Value
	BrightstarDB Abandoned	2012	Triplestore / RDF	Abandoned
BR	BroDB Parody / Joke	2024	Relational	Parody / Joke
	BTDB OLTP	2010	Key/Value, Object-Oriented	OLTP
	BTrDB Abandoned	2014	Relational	Abandoned
	BuntDB OLTP	2016	Key/Value	OLTP
CA	CamaDB Web Browser Abandoned NoSQL	2021	Document / XML	Web Browser Abandoned NoSQL
	CapyDB Nearest Neighbor Search	2024	Document / XML	Nearest Neighbor Search
	CaskDB	2022	Key/Value
	CastleDB	2012	Document / XML
CD	cdb Immutable	1996	Key/Value	Immutable
	CedarDB OLAP Forked Code OLTP	2023	Relational, Array / Matrix	OLAP Forked Code OLTP
	chaozzDB Abandoned	2008	—	Abandoned
	chDB OLAP Acquired Company AI-Assisted	2023	Relational	OLAP Acquired Company AI-Assisted
	CheetahDB	2018	Relational
	ChromoDB Abandoned	2024	Key/Value	Abandoned
	ClearDB Acquired Company	2010	Relational	Acquired Company
	Cloudberry OLAP Forked Code Revival Project	2023	Relational	OLAP Forked Code Revival Project
	CloverDB NoSQL AI-Assisted	2022	Document / XML	NoSQL AI-Assisted
	CnosDB Time-Series	2021	Relational	Time-Series
	CockroachDB NewSQL OLTP AI-Assisted	2014	Relational	NewSQL OLTP AI-Assisted
	CodernityDB	2011	Key/Value
	CoGaDB Abandoned	2012	Relational	Abandoned
	CogDB	2017	Triplestore / RDF
	Comdb2 AI-Assisted	2004	Relational	AI-Assisted
	CompleteDB Abandoned OLTP	2012	Relational	Abandoned OLTP
	ComposeDB Blockchain	2022	Graph	Blockchain
	ComputeDB OLAP Acquired Company Abandoned	2015	Relational	OLAP Acquired Company Abandoned
CO	ConfluxDB	2014	—
	CortexDB Multi-Model NoSQL	2014	Document / XML, Key/Value	Multi-Model NoSQL
	Cosmos DB	2015	Key/Value, Graph, Column Family / Wide-Column
	CouchDB NoSQL	2005	Document / XML	NoSQL
	CozoDB	2022	Relational
	CrateDB	2014	—
	CrossDB	2019	Relational
	CrowdDB	2011	Relational
	CruzDB	2016	—
	CSV Comp DB	2007	Relational
	CurioDB Abandoned NoSQL	2015	Key/Value	Abandoned NoSQL
	CursusDB Abandoned NoSQL	2023	Document / XML	Abandoned NoSQL
	Daffodil DB	2003	Relational
	DaggerDB	2014	Relational
	DalmatinerDB Abandoned	2014	—	Abandoned
	Dare-DB NoSQL	2024	Key/Value	NoSQL
	dashDB Hosting Service	2014	—	Hosting Service
	Db2	1983	Document / XML, Relational
	DB4IoT	2016	Document / XML
	db4o Acquired Company Abandoned	2000	Object-Oriented	Acquired Company Abandoned
	DB5 Abandoned Nearest Neighbor Search	2023	Document / XML, Vector	Abandoned Nearest Neighbor Search
	DB9 Serverless OLTP	2026	Relational	Serverless OLTP
	dBASE xBase	1979	Relational	xBase
	dbeel Abandoned NoSQL	2023	Document / XML	Abandoned 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	2014	Relational	Abandoned
	DeepDB Abandoned Failed Company	2010	Relational	Abandoned Failed Company
	DefraDB Peer-to-Peer AI-Assisted	2019	Document / XML	Peer-to-Peer AI-Assisted
	DegDB Abandoned	2015	Graph	Abandoned
	DensoDB Abandoned	2012	Document / XML	Abandoned
	DeveelDB Abandoned OLTP	2009	Relational	Abandoned OLTP
	DiceDB OLTP	2022	Key/Value	OLTP
	DiggyDB Abandoned	2021	Document / XML	Abandoned
DI	discodb Parody / Joke	2026	—	Parody / Joke
	Djondb Abandoned	2012	Document / XML	Abandoned
	DocumentDB	2019	Document / XML
	DocumentDB Middleware NoSQL AI-Assisted	2023	Document / XML	Middleware NoSQL AI-Assisted
	DolphinDB Time-Series	2018	Relational	Time-Series
DR	DriftDB Immutable AI-Assisted	2025	Relational	Immutable AI-Assisted
	DuckDB OLAP AI-Assisted	2018	Relational	OLAP AI-Assisted
	DuctileDB Abandoned	2015	Graph	Abandoned
	DynamoDB OLTP NoSQL	2012	Document / XML, Key/Value	OLTP NoSQL
	DynomiteDB Cache Abandoned Middleware	2012	Key/Value	Cache Abandoned Middleware
EA	EaseDB Abandoned	2013	Document / XML	Abandoned
	EasyDB Failed Company	2019	Document / XML	Failed Company
	EchoDB	2021	Key/Value
	EcoDB Failed Company	2018	Document / XML	Failed Company
	EdgelessDB Abandoned	2021	Relational	Abandoned
	EinsteinDB Abandoned	2019	Key/Value	Abandoned
	EJDB	2012	Key/Value, Document / XML
	ekoDB	2024	Document / XML
	Elara DB Abandoned	2021	Key/Value	Abandoned
	ElephantDB Abandoned	2011	Key/Value	Abandoned
	ElevateDB	2006	Relational
	EliasDB Abandoned	2016	Graph	Abandoned
EM	EmbedDB Time-Series	2023	Relational	Time-Series
EN	EnnoDB Abandoned	2012	Key/Value	Abandoned
	EraDB Acquired Company	2019	Document / XML	Acquired Company
	EsgynDB Failed Company	2015	Relational	Failed Company
	EuclidesDB Abandoned	2018	Array / Matrix	Abandoned
	EVA DB Abandoned	2018	Relational	Abandoned
	EventSourcingDB Time-Series Immutable	2022	Document / XML	Time-Series Immutable
	evitaDB AI-Assisted	2020	Document / XML	AI-Assisted
	eXist-db NoSQL AI-Assisted	2000	Document / XML	NoSQL AI-Assisted
	ExtendDB Middleware AI-Assisted	2026	Key/Value, Document / XML	Middleware AI-Assisted
	eXtremeDB Cache Time-Series OLTP Middleware	2001	Column Family / Wide-Column, Entity-Relationship, Key/Value, Relational	Cache Time-Series OLTP Middleware
	EyeDB Abandoned	1992	Object-Oriented	Abandoned
	FairCom DB	1984	—
	FalkorDB AI-Assisted	2023	Graph	AI-Assisted
	FastDB	2011	Relational
	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
	FerresDB AI-Assisted	2026	—	AI-Assisted
	FerretDB AI-Assisted	2021	Document / XML	AI-Assisted
FI	FileDb Abandoned NoSQL	2011	Relational	Abandoned NoSQL
	FileDB Abandoned	2010	Key/Value	Abandoned
	FiloDB	2015	—
	FinchDB	2015	Document / XML
	FineDB Abandoned NoSQL	2013	Key/Value	Abandoned NoSQL
	FlashDB	2020	Key/Value
FL	FleetDB Abandoned	2009	Document / XML	Abandoned
FL	FlockDB Abandoned	2010	Graph	Abandoned
FO	ForestDB Abandoned	2013	Key/Value	Abandoned
	FoundationDB Acquired Company OLTP AI-Assisted	2009	Key/Value	Acquired Company OLTP AI-Assisted
	FrostDB Time-Series	2022	Column Family / Wide-Column	Time-Series
	FuelDB Abandoned	2014	Document / XML	Abandoned
	FusionDB Abandoned	2019	Document / XML	Abandoned
	GaussDB	2011	Relational
	GDBM DBM	1990	Key/Value	DBM
	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
	GeoSpock DB Failed Company	2013	Relational	Failed Company
	GhostDB Cache Abandoned	2020	Key/Value	Cache Abandoned
GI	GitDB Versioning	2026	—	Versioning
	GlareDB Abandoned Middleware AI-Assisted	2022	Relational	Abandoned Middleware AI-Assisted
	GlobalsDB	2011	Array / Matrix
	GoatDB Web Browser AI-Assisted	2024	Document / XML	Web Browser AI-Assisted
	GoldenDB	—	—
	GoshawkDB Abandoned	2015	Object-Oriented	Abandoned
	GraphDB	2000	Triplestore / RDF
	GrapheekDB Abandoned	2014	Key/Value, Graph	Abandoned
	GrapheneDB Hosting Service	2012	Graph	Hosting Service
	GreptimeDB Time-Series AI-Assisted	2022	Relational	Time-Series AI-Assisted
	GridDB	2011	Key/Value
	HailDB Abandoned	2010	Key/Value	Abandoned
HA	HaloDB Abandoned	2017	Key/Value	Abandoned
HA	HaloDB Revive Revival Project	2017	—	Revival Project
	HampusDB	2006	Key/Value
HA	HanoiDB Abandoned	2012	Key/Value	Abandoned
	HarperDB Serverless NoSQL	2017	Document / XML	Serverless NoSQL
HA	HaystackDB Abandoned Nearest Neighbor Search MMAP	2024	Vector	Abandoned Nearest Neighbor Search MMAP
	HeavyDB OLAP Acquired Company Abandoned	2013	Relational	OLAP Acquired Company Abandoned
HE	HelinDB	2021	—
	HelixDB OLTP Nearest Neighbor Search AI-Assisted	2024	Graph, Vector	OLTP Nearest Neighbor Search AI-Assisted
	HerdDB	2016	Relational
	HexaDB	2023	Relational
	HexxlaDB AI-Assisted	2026	—	AI-Assisted
HI	hipsterDB Parody / Joke Abandoned	2013	Key/Value	Parody / Joke Abandoned
	HiRDB	1994	Document / XML, Relational
	HollowDB Abandoned Blockchain	2023	Key/Value	Abandoned Blockchain
	HoraeDB Time-Series Abandoned	2021	Relational	Time-Series Abandoned
HO	HorizonDB Geospatial	2025	Document / XML	Geospatial
	hss.db	2009	Relational
	HStreamDB Streaming	2020	Relational	Streaming
	HyperDB Parody / Joke Nearest Neighbor Search	2023	Document / XML, Vector	Parody / Joke Nearest Neighbor Search
	HyperGraphDB	2007	Graph
	iBoxDB Serverless Mobile NoSQL	2014	Document / XML	Serverless Mobile NoSQL
	IceFireDB	2021	Key/Value
	ImmortalDB Web Browser	2018	Key/Value	Web Browser
	Immudb Immutable AI-Assisted	2019	Key/Value	Immutable AI-Assisted
	IndraDB	2016	Graph
	InfiniDB OLAP Abandoned Failed Company	2000	Relational	OLAP Abandoned Failed Company
	InfinityDB	2002	Key/Value, Graph, Array / Matrix, Hierarchical, Relational
	InfluxDB Time-Series AI-Assisted	2013	Column Family / Wide-Column	Time-Series AI-Assisted
	InstantDB Failed Company	1997	Relational	Failed Company
	IonDB Abandoned	2015	Key/Value	Abandoned
	IoTDB Time-Series AI-Assisted	2017	Hierarchical	Time-Series AI-Assisted
	IssunDB	2026	—
	ITTIA DB Time-Series OLTP	2000	Relational	Time-Series OLTP
	JaguarDB Nearest Neighbor Search	2017	Array / Matrix, Key/Value	Nearest Neighbor Search
	JasDB	2013	Document / XML
	JinDB Abandoned	2019	—	Abandoned
	Joedb	2014	Relational
JS	JSDB Abandoned	2020	Document / XML	Abandoned
	JSqlDb	2017	Document / XML
	JuliaDB Abandoned	2017	Relational	Abandoned
JU	JunoDB Abandoned NoSQL	—	Key/Value	Abandoned NoSQL
	JustinDB Abandoned	2015	Key/Value	Abandoned
	JustOneDB Acquired Company	2010	Relational	Acquired Company
KA	KahaDB	—	—
	KairosDB Time-Series	2013	—	Time-Series
	KantoDB OLTP	2025	Relational	OLTP
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 Middleware	2019	Document / XML	Abandoned Middleware
	KeyDB Acquired Company Abandoned NoSQL	2019	—	Acquired Company Abandoned NoSQL
KI	KingDB Abandoned MMAP	2012	Key/Value	Abandoned MMAP
	KitaroDB	2012	Key/Value
	ksqlDB Streaming AI-Assisted	2017	Key/Value, Relational	Streaming AI-Assisted
	KurrentDB Time-Series AI-Assisted	2012	Document / XML	Time-Series AI-Assisted
	KVdb NoSQL	2018	Key/Value	NoSQL
KV	KVDB	2026	—
	LadybugDB Forked Code Revival Project AI-Assisted	2025	Graph	Forked Code Revival Project AI-Assisted
	LanceDB Search Engine AI-Assisted	2023	Document / XML	Search Engine AI-Assisted
	LazyDB	2020	Document / XML
	LedisDB Abandoned NoSQL	2014	Key/Value	Abandoned NoSQL
	LesbianDB Abandoned	2022	Document / XML	Abandoned
	LevelDB MMAP	2011	Key/Value	MMAP
LI	libmdbx Forked Code MMAP	2015	Key/Value	Forked Code MMAP
	LightDB NoSQL	2021	Document / XML	NoSQL
	LightDB Abandoned	2017	Array / Matrix	Abandoned
	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
	LiteDB	2014	Document / XML
LL	LlamaDB Abandoned	2015	—	Abandoned
	LMDB MMAP DBM AI-Assisted	2011	Key/Value	MMAP DBM AI-Assisted
	LocustDB	2017	Relational
	LogosDB AI-Assisted	2026	Vector	AI-Assisted
	LonaDB NoSQL	2023	Document / XML	NoSQL
	LotusDB OLTP	2021	Key/Value	OLTP
LO	LowDB	2014	Document / XML
	LucidDB OLAP Abandoned	2004	Relational	OLAP Abandoned
	LungoDB	2019	Document / XML
	M3DB Time-Series AI-Assisted	2018	Relational	Time-Series AI-Assisted
	MammothDB OLAP Acquired Company	2012	Relational	OLAP Acquired Company
	MangoDB Parody / Joke Abandoned NoSQL	2012	Document / XML	Parody / Joke Abandoned NoSQL
	MapDB Abandoned	2012	Object-Oriented	Abandoned
	MapR-DB Acquired Company	2012	Column Family / Wide-Column	Acquired Company
	MarcelloDB Abandoned	2014	Object-Oriented	Abandoned
	MariaDB AI-Assisted	2009	Relational	AI-Assisted
	MaxDB OLTP	1977	Relational	OLTP
MC	mcdb Abandoned Immutable MMAP	2010	Key/Value	Abandoned Immutable MMAP
MD	MDBM Abandoned	2012	Key/Value	Abandoned
MD	MDBMS	1998	Relational
	MenteDB AI-Assisted	2026	Vector, Graph	AI-Assisted
	MillenniumDB Web Browser	2021	Graph, Triplestore / RDF	Web Browser
MK	mkdb	2023	Relational
	MLDB Acquired Company	2015	—	Acquired Company
	MobyDB	2026	Key/Value
	MonetDB OLAP MMAP	2002	Column Family / Wide-Column	OLAP MMAP
	MongoDB NoSQL AI-Assisted	2009	Document / XML	NoSQL AI-Assisted
	MonographDB	2021	Relational
MU	MuopDB	2024	—
	MyScaleDB OLAP Forked Code Failed Company AI-Assisted	2021	Relational	OLAP Forked Code Failed Company AI-Assisted
	NamiDB NoSQL	2026	Graph	NoSQL
	NarayanaDB	2025	—
	NavDB Abandoned	2017	Key/Value, Relational	Abandoned
ND	NDB Cluster Acquired Company OLTP	—	Key/Value	Acquired Company OLTP
	NeDB Abandoned	2013	Document / XML	Abandoned
	NeoDatis ODB Abandoned	2006	Object-Oriented	Abandoned
	nessDB Abandoned	2011	Key/Value	Abandoned
	NeuroDB	2020	Graph
	NexusDB	2003	Relational
	NodeDB Multi-Model Nearest Neighbor Search AI-Assisted	2026	Vector, Graph, Array / Matrix, Document / XML, Relational	Multi-Model Nearest Neighbor Search AI-Assisted
	NornicDB Nearest Neighbor Search AI-Assisted	2025	Graph	Nearest Neighbor Search AI-Assisted
	NosDB Abandoned	2013	Document / XML	Abandoned
	NucliaDB Nearest Neighbor Search Search Engine	2021	Vector	Nearest Neighbor Search Search Engine
	NuDB Abandoned	2016	Key/Value	Abandoned
	NunDB	2018	Object-Oriented
	NuoDB NewSQL Acquired Company	2010	Relational	NewSQL Acquired Company
	NutsDB AI-Assisted	2018	Key/Value	AI-Assisted
	OasysDB Nearest Neighbor Search	2023	Key/Value, Vector	Nearest Neighbor Search
	ObjectDB	2010	Object-Oriented
	Objectivity/DB	1990	Object-Oriented
	ObsessionDB OLAP Hosting Service	2024	Relational	OLAP Hosting Service
	OctaneDB Nearest Neighbor Search	2025	Vector	Nearest Neighbor Search
	OctopusDB	2010	—
	OlegDB MMAP NoSQL	2014	Key/Value	MMAP NoSQL
	OnceDB Cache Abandoned Failed Company	2016	Document / XML	Cache Abandoned Failed Company
	OneDB	2020	Relational
OP	open-gpdb OLAP Forked Code	2024	Relational	OLAP Forked Code
	OpenMLDB	2017	Relational
	OpenTSDB Time-Series	2010	Key/Value	Time-Series
	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	2011	Key/Value, Graph, Object-Oriented, Document / XML, Relational	Abandoned
	OrioleDB Acquired Company AI-Assisted	2021	Relational	Acquired Company AI-Assisted
	OushuDB	2016	Relational
PA	PalDB Abandoned	2015	Key/Value	Abandoned
	PancakeDB	2021	—
	ParadeDB OLAP Nearest Neighbor Search Search Engine AI-Assisted	2023	Relational	OLAP Nearest Neighbor Search Search Engine AI-Assisted
PE	PearlDB Abandoned	2015	Key/Value	Abandoned
	PhotonDB Abandoned	2022	Key/Value	Abandoned
	pickleDB	2011	Document / XML
PI	PicoDB Abandoned	2016	Document / XML	Abandoned
	PieCloudDB OLAP	2021	Relational	OLAP
	piladb Abandoned	2015	Object-Oriented	Abandoned
	PinusDB Abandoned	2019	Relational	Abandoned
	PipelineDB Acquired Company Abandoned Streaming	2013	Relational	Acquired Company Abandoned Streaming
	PolarDB	2017	Relational
	PoloDB NoSQL	2020	Document / XML	NoSQL
	PosDB OLAP	2017	Relational	OLAP
	PouchDB Web Browser NoSQL	2010	Document / XML	Web Browser NoSQL
PR	PranaDB Abandoned	2022	Relational	Abandoned
	PrestoDB OLAP AI-Assisted	2013	Document / XML, Key/Value, Column Family / Wide-Column, Relational	OLAP AI-Assisted
	ProfaneDB Abandoned	2017	Object-Oriented	Abandoned
	ProvenDB Acquired Company Blockchain Middleware	2018	Document / XML	Acquired Company Blockchain Middleware
	PuffinDB Serverless Abandoned	2023	Relational	Serverless Abandoned
	PumpkinDB Abandoned Immutable	2017	Key/Value	Abandoned Immutable
	PupDB Abandoned	2019	Key/Value	Abandoned
	PysonDB Abandoned NoSQL	2020	Document / XML	Abandoned NoSQL
	qikkDB OLAP Abandoned Failed Company	2019	Relational	OLAP Abandoned Failed Company
	QLDB Abandoned Blockchain	2018	Document / XML	Abandoned Blockchain
	quasardb	2008	Key/Value
	QuestDB Time-Series AI-Assisted	2014	Relational	Time-Series AI-Assisted
	QuineDB	2016	Key/Value
	RadonDB Abandoned Failed Company	2018	Relational	Abandoned Failed Company
	RageDB Abandoned	2021	Graph	Abandoned
	RaimaDB Time-Series	1984	Network, Relational	Time-Series
	RapidsDB OLAP Middleware	2014	—	OLAP Middleware
	RaptorDB Forked Code	2024	Relational	Forked Code
	RaptorDB Abandoned	2012	Document / XML	Abandoned
	RavenDB MMAP NoSQL AI-Assisted	2009	Document / XML, Key/Value	MMAP NoSQL AI-Assisted
	RayforceDB OLAP AI-Assisted	2023	Relational	OLAP AI-Assisted
	/rdb Abandoned	1984	Relational	Abandoned
RD	RDBMS	1974	Relational
	Rdb/VMS Acquired Company	1984	Relational	Acquired Company
	redb OLTP AI-Assisted	2018	Key/Value	OLTP AI-Assisted
	RedixDB Abandoned	2018	Key/Value	Abandoned
RE	RefineDB Abandoned	2021	Document / XML	Abandoned
	ReifyDB OLTP	2025	Relational	OLTP
RE	Relatude.DB	2025	Graph, Object-Oriented
	ResilientDB Blockchain	2019	Document / XML	Blockchain
	RethinkDB Failed Company NoSQL	2009	Document / XML	Failed Company NoSQL
	RexDB Acquired Company	2006	Relational	Acquired Company
	RhizomeDB Abandoned Peer-to-Peer	2022	Relational	Abandoned Peer-to-Peer
	Rockall-DB	—	—
	RocksDB Forked Code OLTP	2012	Key/Value	Forked Code OLTP
	RonDB OLTP AI-Assisted	2020	Key/Value, Relational	OLTP AI-Assisted
	RoseDB NoSQL AI-Assisted	2020	Key/Value	NoSQL 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
	SableDb Cache NoSQL	2024	Key/Value	Cache NoSQL
	SapphireDb Abandoned	2018	Object-Oriented	Abandoned
SB	sboxdb	2024	—
	ScalarDB	—	—
	ScaleDB Failed Company	2005	—	Failed Company
	ScalienDB Abandoned Failed Company	2010	Key/Value	Abandoned Failed Company
	SciDB OLAP	2008	Array / Matrix	OLAP
	ScimoreDB	2005	Relational
	ScopeDB	2024	Relational
	ScratchDB OLAP Middleware	2023	Document / XML	OLAP Middleware
SD	SDB	—	Document / XML, Relational
	SeekDB AI-Assisted	2025	Relational, Vector	AI-Assisted
	SenseiDB Abandoned	2012	Relational	Abandoned
	SequoiaDB	2011	Document / XML
	SereneDB OLAP OLTP Search Engine AI-Assisted	2024	Relational	OLAP OLTP Search Engine AI-Assisted
SH	SharedDB	2012	Relational
	Siaqodb Abandoned Failed Company NoSQL	—	Document / XML	Abandoned Failed Company NoSQL
	SignalDB NoSQL AI-Assisted	2023	Document / XML	NoSQL AI-Assisted
	SimpleDB NoSQL	2007	Key/Value	NoSQL
	Siodb Abandoned	2018	Relational	Abandoned
	Sir.DB Abandoned	2020	Document / XML	Abandoned
	SiriDB Time-Series	2016	—	Time-Series
	SirixDB AI-Assisted	2012	Document / XML	AI-Assisted
	SKDB OLTP AI-Assisted	2022	Relational	OLTP AI-Assisted
SK	SkeletonDB Abandoned	2016	—	Abandoned
SK	SkyDB	2013	—
	SlateDB AI-Assisted	2024	Key/Value	AI-Assisted
	SleekDB	2018	Document / XML
	SlothDB	2026	Relational
SL	Slumber DB Abandoned	2014	Key/Value	Abandoned
SM	SmithDB OLAP	2026	—	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	—
	sones GraphDB Abandoned Failed Company	2007	Graph	Abandoned Failed Company
	SpacetimeDB OLTP AI-Assisted	2023	Relational	OLTP AI-Assisted
	SparkleDB OLTP	2013	Graph	OLTP
	SparrowDB Abandoned	2016	Key/Value	Abandoned
	SparrowDB AI-Assisted	2026	Graph	AI-Assisted
	Speedb Forked Code Acquired Company	2020	Key/Value	Forked Code Acquired Company
	SpiceDB Middleware AI-Assisted	2021	Object-Oriented	Middleware AI-Assisted
	SplinterDB NoSQL	2018	Key/Value	NoSQL
	SpreadsheetDB Failed Company	2017	Document / XML	Failed Company
	SSDB Abandoned	2013	Key/Value	Abandoned
	StereoDB OLTP	2023	Relational	OLTP
	StoneDB OLAP Failed Company	2022	Relational	OLAP Failed Company
	StormDB Acquired Company	2012	Relational	Acquired Company
ST	StormiDB NoSQL	2024	Document / XML	NoSQL
	StrixDB	—	Triplestore / RDF
	STSdb Failed Company	2008	Key/Value	Failed Company
	SummitDB Abandoned NoSQL	2016	Key/Value	Abandoned NoSQL
	SurrealDB Serverless Multi-Model AI-Assisted	2016	Document / XML, Graph, Relational	Serverless Multi-Model AI-Assisted
	SwarnDB	2025	—
	SwayDB Abandoned	2018	Key/Value	Abandoned
	SWC-DB Abandoned	2019	Column Family / Wide-Column, Key/Value	Abandoned
	SwellDB AI-Assisted	2025	Relational	AI-Assisted
	SylvaDB Abandoned	2009	Graph	Abandoned
	TabDB Parody / Joke Abandoned	2019	Relational	Parody / Joke Abandoned
	TaffyDB Abandoned	2009	Document / XML	Abandoned
	Tdbengine	1985	Relational
	TDbf xBase	—	—	xBase
	TerarkDB Forked Code Acquired Company	2016	Key/Value	Forked Code Acquired Company
	TerminusDB AI-Assisted	2019	Document / XML, Graph, Triplestore / RDF	AI-Assisted
	ThreadDB Abandoned Peer-to-Peer	2019	Document / XML	Abandoned Peer-to-Peer
	ThruDB	2006	—
	TiDB NewSQL AI-Assisted	2015	Key/Value	NewSQL AI-Assisted
	TidesDB OLTP	2024	Column Family / Wide-Column	OLTP
	TieredMemDB Cache Forked Code Abandoned NoSQL	2020	Key/Value	Cache Forked Code Abandoned NoSQL
	TileDB NoSQL	2014	Array / Matrix	NoSQL
	TimescaleDB Time-Series AI-Assisted	2017	Relational	Time-Series AI-Assisted
	TingoDB Abandoned	2013	Document / XML	Abandoned
	TinyDB	2013	Document / XML
	TinyDB Query Engine Peer-to-Peer	1999	Relational	Query Engine Peer-to-Peer
	TokuDB Acquired Company Abandoned	2009	Relational	Acquired Company Abandoned
	TonicDB OLTP	2025	Key/Value	OLTP
	ToplingDB Forked Code AI-Assisted	2021	Key/Value	Forked Code AI-Assisted
	ToroDB Abandoned	—	Document / XML	Abandoned
	toyDB	2019	Relational
	TrailDB Abandoned	2014	Relational	Abandoned
	TreodeDB Abandoned	2012	Key/Value	Abandoned
	TukDB Search Engine	2024	Document / XML	Search Engine
	TypeDB AI-Assisted	2016	Entity-Relationship, Graph	AI-Assisted
	UnisonDB Multi-Model	2025	Column Family / Wide-Column, Key/Value	Multi-Model
	UnumDB Abandoned Failed Company	2015	Document / XML, Graph, Key/Value, Array / Matrix	Abandoned Failed Company
	upscaledb OLAP Abandoned	2007	Key/Value	OLAP Abandoned
	VanillaDB Abandoned	2016	Multi-Value	Abandoned
VE	vecdb Nearest Neighbor Search Search Engine MMAP	2026	Document / XML, Vector	Nearest Neighbor Search Search Engine MMAP
	VectorDB Nearest Neighbor Search	2023	Document / XML, Vector	Nearest Neighbor Search
	VectorDB Abandoned Nearest Neighbor Search	2023	Document / XML, Vector	Abandoned Nearest Neighbor Search
	VelarixDB	2024	Key/Value
	VelocityDB Abandoned	2011	Object-Oriented	Abandoned
	VeloxDB OLTP	2022	Object-Oriented	OLTP
	VennDB	2023	Relational
	VertexDB Abandoned	2009	Graph	Abandoned
	VistaDB	2009	—
	Vitesse DB OLAP	2014	Relational	OLAP
	ViyaDB OLAP Abandoned	2017	Relational	OLAP Abandoned
	voidDB OLTP MMAP	2024	Key/Value	OLTP MMAP
	VoltDB NewSQL	2009	Relational	NewSQL
VU	VulcanDB Failed Company	2012	Object-Oriented	Failed Company
	vyhodb Abandoned	2012	Network	Abandoned
	WakandaDB Failed Company	1996	Document / XML	Failed Company
	WhiteDB Abandoned	2008	Network	Abandoned
	WonderDB Abandoned OLTP	2013	Relational	Abandoned OLTP
XD	XDB Enterprise Server Acquired Company	1998	Relational	Acquired Company
	XTDB AI-Assisted	2018	Document / XML	AI-Assisted
	YantrikDB AI-Assisted	2026	—	AI-Assisted
	YaraDB	2025	Document / XML
	YDB NewSQL OLTP AI-Assisted	2014	Relational	NewSQL OLTP AI-Assisted
	YottaDB NoSQL	2001	Key/Value	NoSQL
	YouTrackDB Forked Code AI-Assisted	2024	Graph	Forked Code AI-Assisted
	YugabyteDB Forked Code OLTP AI-Assisted	2016	Key/Value, Relational	Forked Code OLTP AI-Assisted
	ZeptoDB Time-Series AI-Assisted	2026	—	Time-Series AI-Assisted
	ZeroDB Abandoned	2015	Document / XML	Abandoned
	ZippyDB Cache Serverless Failed Company	2014	Key/Value	Cache Serverless Failed Company
	ZippyDB	2013	Key/Value
	ZODB	2002	Object-Oriented
	ZooDB Abandoned	2008	Object-Oriented	Abandoned