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Databases Licensed Under Apache v2

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AB	abhot Time-Series Forked Code Abandoned	2017	—	Apache v2	Time-Series Forked Code Abandoned
	Accumulo NoSQL	2008	Column Family / Wide-Column	Apache v2	NoSQL
AG	AgateDB Abandoned	2019	Key/Value	Apache v2	Abandoned
	AGEDB Middleware AI-Assisted	2019	Graph	Apache v2	Middleware AI-Assisted
	AgensGraph Forked Code Multi-Model Acquired Company	2013	Document / XML, Graph, Key/Value, Relational	Apache v2	Forked Code Multi-Model Acquired Company
	Akumuli Time-Series Abandoned	2013	Relational	Apache v2	Time-Series Abandoned
	Akutan Abandoned	2019	Triplestore / RDF	Apache v2	Abandoned
	Alenka Abandoned	2012	Relational	Apache v2	Abandoned
AN	AngstromDB Abandoned	2013	Key/Value	Apache v2	Abandoned
	AnnaDB Abandoned NoSQL	2021	Document / XML	Apache v2	Abandoned NoSQL
	AnnDB Nearest Neighbor	2020	Vector	Apache v2	Nearest Neighbor
	AntDB Forked Code	—	Relational	Apache v2	Forked Code
	Antidote	2015	Key/Value	Apache v2
	Arakoon Abandoned	2010	Key/Value	Apache v2	Abandoned
	ArangoDB Multi-Model AI-Assisted	2011	Document / XML, Graph, Key/Value	Apache v2	Multi-Model AI-Assisted
	ArcadeDB Forked Code AI-Assisted	2021	Document / XML, Graph, Key/Value, Relational	Apache v2	Forked Code AI-Assisted
	AresDB OLAP Abandoned	2018	Relational	Apache v2	OLAP Abandoned
	AsterixDB OLAP AI-Assisted	2009	Document / XML	Apache v2	OLAP AI-Assisted
	AverageDB Parody / Joke	2024	Document / XML	Apache v2	Parody / Joke
	AwaDB Abandoned Nearest Neighbor	2023	Document / XML, Vector	Apache v2	Abandoned Nearest Neighbor
	BadgerDB AI-Assisted	2017	Key/Value	Apache v2	AI-Assisted
	Bagri Abandoned	2014	Document / XML	Apache v2	Abandoned
	BaikalDB	2018	Relational	Apache v2
	Barrel DB	2025	Document / XML, Vector	Apache v2
	BayesDB Abandoned	2015	—	Apache v2	Abandoned
	BBoxDB AI-Assisted	2015	Array / Matrix	Apache v2	AI-Assisted
	Berkeley DB Acquired Company OLTP DBM	1994	Document / XML, Key/Value	Apache v2	Acquired Company OLTP DBM
	BigchainDB Abandoned Blockchain	2015	Document / XML, Key/Value	Apache v2	Abandoned Blockchain
	Bitsy	2013	Graph	Apache v2
	BlazingSQL OLAP Abandoned Failed Company	2015	Relational	Apache v2	OLAP Abandoned Failed Company
	Bleve Search Engine AI-Assisted	2014	Document / XML, Vector	Apache v2	Search Engine AI-Assisted
	BlinkDB Abandoned	2012	Relational	Apache v2	Abandoned
	Blueflood Time-Series Abandoned	2013	Column Family / Wide-Column	Apache v2	Time-Series Abandoned
	BonsaiDb	2021	Key/Value	Apache v2
	ByConity OLAP	2020	Relational	Apache v2	OLAP
	Cassandra NoSQL AI-Assisted	2008	Key/Value, Column Family / Wide-Column	Apache v2	NoSQL AI-Assisted
	Cayley Abandoned	2014	Triplestore / RDF	Apache v2	Abandoned
	chDB OLAP Acquired Company AI-Assisted	2023	Relational	Apache v2	OLAP Acquired Company AI-Assisted
	Chroma Nearest Neighbor AI-Assisted	2022	Document / XML	Apache v2	Nearest Neighbor AI-Assisted
	Chronix Time-Series Abandoned	2015	—	Apache v2	Time-Series Abandoned
	ClickHouse OLAP AI-Assisted	2016	Relational	Apache v2	OLAP AI-Assisted
	CloseVector Nearest Neighbor	2023	Document / XML, Vector	Apache v2	Nearest Neighbor
	Cloudberry OLAP Forked Code Revival Project	2023	Relational	Apache v2	OLAP Forked Code Revival Project
	CodernityDB	2011	Key/Value	Apache v2
	Comdb2 AI-Assisted	2004	Relational	Apache v2	AI-Assisted
	Compass Abandoned Search Engine	2006	Document / XML, Object-Oriented	Apache v2	Abandoned Search Engine
	ComposeDB Blockchain	2022	Graph	Apache v2	Blockchain
	ComputeDB OLAP Acquired Company Abandoned	2015	Relational	Apache v2	OLAP Acquired Company Abandoned
	Concourse	2012	Document / XML	Apache v2
	Condensation Abandoned Blockchain	2020	Object-Oriented	Apache v2	Abandoned Blockchain
	Couchbase NoSQL	2010	Key/Value, Document / XML	Apache v2	NoSQL
	CouchDB NoSQL	2005	Document / XML	Apache v2	NoSQL
	CovenantSQL Abandoned Blockchain	2018	Relational	Apache v2	Abandoned Blockchain
	CrateDB	2014	—	Apache v2
	Databend AI-Assisted	2020	Relational	Apache v2	AI-Assisted
	DataFusion Query Engine AI-Assisted	2016	Relational	Apache v2	Query Engine AI-Assisted
	dbeel Abandoned NoSQL	2023	Document / XML	Apache v2	Abandoned NoSQL
	Delta Lake AI-Assisted	2019	Column Family / Wide-Column	Apache v2	AI-Assisted
	Derby Acquired Company Abandoned OLTP	1997	Relational	Apache v2	Acquired Company Abandoned OLTP
	DeveelDB Abandoned OLTP	2009	Relational	Apache v2	Abandoned OLTP
	DGraph Acquired Company AI-Assisted	2015	Graph	Apache v2	Acquired Company AI-Assisted
	Dolt Versioning AI-Assisted	2018	Relational	Apache v2	Versioning AI-Assisted
	Doris OLAP AI-Assisted	2017	Relational	Apache v2	OLAP AI-Assisted
DQ	Dqlite	2017	Relational	Apache v2
	Dremio OLAP Query Engine Acquired Company Data Lake	2015	Relational	Apache v2	OLAP Query Engine Acquired Company Data Lake
	Drill OLAP AI-Assisted	2012	Column Family / Wide-Column	Apache v2	OLAP AI-Assisted
	Druid OLAP AI-Assisted	2011	Column Family / Wide-Column	Apache v2	OLAP AI-Assisted
	DuctileDB Abandoned	2015	Graph	Apache v2	Abandoned
	DynomiteDB Cache Abandoned Middleware	2012	Key/Value	Apache v2	Cache Abandoned Middleware
	EchoDB	2021	Key/Value	Apache v2
	Ehcache Cache Acquired Company	2003	Key/Value	Apache v2	Cache Acquired Company
	ElaSQL Abandoned	2016	Relational	Apache v2	Abandoned
	Elasticsearch Search Engine NoSQL AI-Assisted	2004	Document / XML	Apache v2	Search Engine NoSQL AI-Assisted
	Engula	2022	Key/Value	Apache v2
	etcd Acquired Company	2013	Key/Value	Apache v2	Acquired Company
	EuclidesDB Abandoned	2018	Array / Matrix	Apache v2	Abandoned
	EuclidOLAP OLAP	2022	Array / Matrix	Apache v2	OLAP
	EVA DB Abandoned	2018	Relational	Apache v2	Abandoned
	EVCache Cache	2012	Key/Value	Apache v2	Cache
	ExtendDB Middleware AI-Assisted	2026	Key/Value, Document / XML	Apache v2	Middleware AI-Assisted
	FBase Time-Series	2022	Relational	Apache v2	Time-Series
	FeatureBase Abandoned Search Engine	2017	Relational	Apache v2	Abandoned Search Engine
	FerresDB AI-Assisted	2026	—	Apache v2	AI-Assisted
FE	Ferrite OLTP	2024	Relational	Apache v2	OLTP
	FiloDB	2015	—	Apache v2
	FineDB Abandoned NoSQL	2013	Key/Value	Apache v2	Abandoned NoSQL
	Fireproof Peer-to-Peer AI-Assisted	2022	Document / XML	Apache v2	Peer-to-Peer AI-Assisted
	Fjall OLTP	2023	Key/Value	Apache v2	OLTP
	FlashDB	2020	Key/Value	Apache v2
FL	FlockDB Abandoned	2010	Graph	Apache v2	Abandoned
FO	Fongo Abandoned NoSQL	2012	Document / XML	Apache v2	Abandoned NoSQL
FO	ForestDB Abandoned	2013	Key/Value	Apache v2	Abandoned
	FoundationDB Acquired Company OLTP AI-Assisted	2009	Key/Value	Apache v2	Acquired Company OLTP AI-Assisted
	FrostDB Time-Series	2022	Column Family / Wide-Column	Apache v2	Time-Series
	Gaffer Abandoned	2016	Entity-Relationship	Apache v2	Abandoned
	Gel OLAP AI-Assisted	2018	Relational	Apache v2	OLAP AI-Assisted
	Geode Cache Forked Code OLTP NoSQL	2015	Key/Value	Apache v2	Cache Forked Code OLTP NoSQL
	Gnocchi Time-Series Middleware	2014	Relational	Apache v2	Time-Series Middleware
	GoatDB Web Browser AI-Assisted	2024	Document / XML	Apache v2	Web Browser AI-Assisted
	Grafeo AI-Assisted	2026	—	Apache v2	AI-Assisted
	Graphik Abandoned	2020	Document / XML	Apache v2	Abandoned
	Greenplum OLAP Forked Code Acquired Company	2003	Relational	Apache v2	OLAP Forked Code Acquired Company
	GreptimeDB Time-Series AI-Assisted	2022	Relational	Apache v2	Time-Series AI-Assisted
	GridDB	2011	Key/Value	Apache v2
	GridGain	2007	Key/Value	Apache v2
	GUN Peer-to-Peer	2014	Graph	Apache v2	Peer-to-Peer
	Hadoop OLAP AI-Assisted	2006	—	Apache v2	OLAP AI-Assisted
HA	HaloDB Abandoned	2017	Key/Value	Apache v2	Abandoned
	HAWQ OLAP Abandoned Middleware	2015	Relational	Apache v2	OLAP Abandoned Middleware
HA	HaystackDB Abandoned Nearest Neighbor MMAP	2024	Vector	Apache v2	Abandoned Nearest Neighbor MMAP
	Hazelcast Cache	2008	Key/Value	Apache v2	Cache
	HBase NoSQL	2007	Column Family / Wide-Column	Apache v2	NoSQL
	HeavyDB OLAP Acquired Company Abandoned	2013	Relational	Apache v2	OLAP Acquired Company Abandoned
	HelixDB OLTP Nearest Neighbor AI-Assisted	2024	Vector, Graph	Apache v2	OLTP Nearest Neighbor AI-Assisted
	HerdDB	2016	Relational	Apache v2
	Heroic Abandoned	2015	Key/Value	Apache v2	Abandoned
	Hibari Acquired Company Abandoned	2005	Key/Value	Apache v2	Acquired Company Abandoned
	Histore Abandoned	2018	Key/Value	Apache v2	Abandoned
	Hive Abandoned	2019	Key/Value	Apache v2	Abandoned
	Hive OLAP AI-Assisted	2010	Relational	Apache v2	OLAP AI-Assisted
	HoraeDB Time-Series Abandoned	2021	Relational	Apache v2	Time-Series Abandoned
	HugeGraph Middleware AI-Assisted	2017	Graph	Apache v2	Middleware AI-Assisted
	Hydra OLAP Abandoned Failed Company	2022	Relational	Apache v2	OLAP Abandoned Failed Company
	HyperGraphDB	2007	Graph	Apache v2
	IceFireDB	2021	Key/Value	Apache v2
	Ignite	2014	Key/Value	Apache v2
	Immudb Immutable AI-Assisted	2019	Key/Value	Apache v2	Immutable AI-Assisted
	Impala OLAP AI-Assisted	2013	Relational	Apache v2	OLAP AI-Assisted
	Infinispan Cache	2009	Key/Value	Apache v2	Cache
	Infinity Nearest Neighbor	2022	Relational	Apache v2	Nearest Neighbor
	Infino Query Engine Nearest Neighbor	—	Relational	Apache v2	Query Engine Nearest Neighbor
	IoTDB Time-Series AI-Assisted	2017	Hierarchical	Apache v2	Time-Series AI-Assisted
	Jackrabbit	2004	Object-Oriented	Apache v2
	JanusGraph Acquired Company	2012	Graph	Apache v2	Acquired Company
	Jena AI-Assisted	2000	Triplestore / RDF	Apache v2	AI-Assisted
JU	JunoDB Abandoned NoSQL	—	Key/Value	Apache v2	Abandoned NoSQL
	JustinDB Abandoned	2015	Key/Value	Apache v2	Abandoned
KA	KahaDB	—	—	Apache v2
	KairosDB Time-Series	2013	—	Apache v2	Time-Series
KA	KarelDB	2019	Relational	Apache v2
	KektorDB Nearest Neighbor	2025	Graph	Apache v2	Nearest Neighbor
KR	Krati Abandoned OLTP NoSQL	2010	Key/Value	Apache v2	Abandoned OLTP NoSQL
	Kronotop NoSQL	2023	Document / XML	Apache v2	NoSQL
	Kudu OLTP	2016	Relational	Apache v2	OLTP
	Kvrocks NoSQL AI-Assisted	2019	Key/Value	Apache v2	NoSQL AI-Assisted
	Kylin	2013	Key/Value	Apache v2
	Kyuubi Middleware AI-Assisted	2017	Relational	Apache v2	Middleware AI-Assisted
	LanceDB Search Engine AI-Assisted	2023	Document / XML	Apache v2	Search Engine AI-Assisted
	LinDB	2019	Column Family / Wide-Column	Apache v2
LI	LineairDB AI-Assisted	2020	Key/Value	Apache v2	AI-Assisted
	LintDB Nearest Neighbor	2024	Vector	Apache v2	Nearest Neighbor
LI	LittleD Abandoned	—	—	Apache v2	Abandoned
	LotusDB OLTP	2021	Key/Value	Apache v2	OLTP
	Lovefield Web Browser Abandoned	2014	Relational	Apache v2	Web Browser Abandoned
	Lucene Search Engine MMAP AI-Assisted	1999	Document / XML	Apache v2	Search Engine MMAP AI-Assisted
	LucidDB OLAP Abandoned	2004	Relational	Apache v2	OLAP Abandoned
	M3DB Time-Series AI-Assisted	2018	Relational	Apache v2	Time-Series AI-Assisted
	MapDB Abandoned	2012	Object-Oriented	Apache v2	Abandoned
	Marqo Search Engine AI-Assisted	2022	Document / XML, Vector	Apache v2	Search Engine AI-Assisted
	MatrixOne OLAP OLTP Streaming AI-Assisted	2021	Relational	Apache v2	OLAP OLTP Streaming AI-Assisted
	Mentat Abandoned	2016	Relational	Apache v2	Abandoned
	MenteDB AI-Assisted	2026	Vector, Graph	Apache v2	AI-Assisted
	Milvus Nearest Neighbor AI-Assisted	2019	Vector	Apache v2	Nearest Neighbor AI-Assisted
	MLDB Acquired Company	2015	—	Apache v2	Acquired Company
	MobyDB	2026	Key/Value	Apache v2
	ModeShape Abandoned	2008	Object-Oriented	Apache v2	Abandoned
	Multigres Middleware AI-Assisted	2025	Relational	Apache v2	Middleware AI-Assisted
	MyScaleDB OLAP Forked Code Failed Company AI-Assisted	2021	Relational	Apache v2	OLAP Forked Code Failed Company AI-Assisted
NA	Nanolat Abandoned	2012	Key/Value	Apache v2	Abandoned
	NarayanaDB OLAP AI-Assisted	2025	Relational	Apache v2	OLAP AI-Assisted
	NavDB Abandoned	2017	Key/Value, Relational	Apache v2	Abandoned
	NCache Cache	2015	Key/Value	Apache v2	Cache
	Nebula Graph	2018	Graph	Apache v2
	Neon Serverless Forked Code Acquired Company OLTP	2021	Relational	Apache v2	Serverless Forked Code Acquired Company OLTP
	Neug AI-Assisted	2026	Graph	Apache v2	AI-Assisted
	Nitrite NoSQL AI-Assisted	2017	Document / XML	Apache v2	NoSQL AI-Assisted
	NodeDB Multi-Model Nearest Neighbor AI-Assisted	2026	Vector, Graph, Array / Matrix, Document / XML, Relational	Apache v2	Multi-Model Nearest Neighbor AI-Assisted
	NoKV NoSQL AI-Assisted	2024	Key/Value	Apache v2	NoSQL AI-Assisted
	Noms Versioning Abandoned	2015	Document / XML	Apache v2	Versioning Abandoned
	NosDB Abandoned	2013	Document / XML	Apache v2	Abandoned
	nubmq Cache	2024	Key/Value	Apache v2	Cache
	Numstore Query Engine	2026	Array / Matrix	Apache v2	Query Engine
	NutsDB AI-Assisted	2018	Key/Value	Apache v2	AI-Assisted
	OasysDB Nearest Neighbor	2023	Key/Value, Vector	Apache v2	Nearest Neighbor
	ObjectBox Time-Series Nearest Neighbor MMAP Mobile NoSQL	2016	Object-Oriented	Apache v2	Time-Series Nearest Neighbor MMAP Mobile NoSQL
	OctoSQL Query Engine Abandoned	2019	Relational	Apache v2	Query Engine Abandoned
	openGemini Time-Series AI-Assisted	2022	Relational	Apache v2	Time-Series AI-Assisted
OP	open-gpdb OLAP Forked Code	2024	Relational	Apache v2	OLAP Forked Code
	OpenMLDB	2017	Relational	Apache v2
	OpenSearch Forked Code Search Engine AI-Assisted	2021	Document / XML	Apache v2	Forked Code Search Engine AI-Assisted
	Opteryx OLAP Serverless AI-Assisted	2021	Relational	Apache v2	OLAP Serverless AI-Assisted
	Oracle NoSQL NoSQL	2011	Key/Value	Apache v2	NoSQL
	OrientDB Multi-Model Acquired Company NoSQL	2010	Document / XML, Graph, Key/Value, Object-Oriented	Apache v2	Multi-Model Acquired Company NoSQL
	Oxia AI-Assisted	2021	Key/Value	Apache v2	AI-Assisted
	OxidSQL	2022	Relational	Apache v2
	Oxigraph	2018	Graph, Triplestore / RDF	Apache v2
	Pail Peer-to-Peer	2022	Key/Value	Apache v2	Peer-to-Peer
PA	PalDB Abandoned	2015	Key/Value	Apache v2	Abandoned
	Paper Abandoned NoSQL	2015	Key/Value, Object-Oriented	Apache v2	Abandoned NoSQL
	Phoenix Middleware AI-Assisted	2014	Relational	Apache v2	Middleware AI-Assisted
	PhotonDB Abandoned	2022	Key/Value	Apache v2	Abandoned
	Pilosa Abandoned	2017	Vector	Apache v2	Abandoned
	Pinot OLAP AI-Assisted	2014	Relational	Apache v2	OLAP AI-Assisted
	Pogreb MMAP	2018	Key/Value	Apache v2	MMAP
	PoloDB NoSQL	2020	Document / XML	Apache v2	NoSQL
	Polypheny	2017	Document / XML, Graph, Relational	Apache v2
	PouchDB Web Browser NoSQL	2010	Document / XML	Apache v2	Web Browser NoSQL
	PrestoDB OLAP AI-Assisted	2013	Document / XML, Key/Value, Column Family / Wide-Column, Relational	Apache v2	OLAP AI-Assisted
	Prometheus Time-Series AI-Assisted	2012	Key/Value	Apache v2	Time-Series AI-Assisted
	Proton Streaming AI-Assisted	2021	Relational	Apache v2	Streaming AI-Assisted
	Qdrant Nearest Neighbor Search Engine MMAP AI-Assisted	2020	Vector	Apache v2	Nearest Neighbor Search Engine MMAP AI-Assisted
	qikkDB OLAP Abandoned Failed Company	2019	Relational	Apache v2	OLAP Abandoned Failed Company
	QuestDB Time-Series AI-Assisted	2014	Relational	Apache v2	Time-Series AI-Assisted
	Quickstep OLAP Abandoned	2013	Relational	Apache v2	OLAP Abandoned
	Quokka OLAP Abandoned	2021	Relational	Apache v2	OLAP Abandoned
	RageDB Abandoned	2021	Graph	Apache v2	Abandoned
	Realm Acquired Company Abandoned Mobile	2011	Object-Oriented	Apache v2	Acquired Company Abandoned Mobile
	redb OLTP AI-Assisted	2018	Key/Value	Apache v2	OLTP AI-Assisted
	RedoxQL	2024	Relational	Apache v2
	ReifyDB OLTP	2025	Relational	Apache v2	OLTP
	Rel	2004	Relational	Apache v2
	ResilientDB Blockchain	2019	Document / XML	Apache v2	Blockchain
	RethinkDB Failed Company NoSQL	2009	Document / XML	Apache v2	Failed Company NoSQL
	RhizomeDB Abandoned Peer-to-Peer	2022	Relational	Apache v2	Abandoned Peer-to-Peer
	Riak Abandoned Failed Company NoSQL	2010	Key/Value	Apache v2	Abandoned Failed Company NoSQL
	RisingLight	2021	Relational	Apache v2
	RisingWave Streaming AI-Assisted	2021	Relational	Apache v2	Streaming AI-Assisted
	RocksDB Forked Code OLTP	2012	Key/Value	Apache v2	Forked Code OLTP
	RxDB AI-Assisted	2016	Document / XML	Apache v2	AI-Assisted
	Rya Abandoned Middleware NoSQL	2012	Triplestore / RDF	Apache v2	Abandoned Middleware NoSQL
	Scalaris Abandoned	2009	Key/Value	Apache v2	Abandoned
	Seafowl OLAP Acquired Company	2022	Relational	Apache v2	OLAP Acquired Company
	Sedna Abandoned	2003	Document / XML	Apache v2	Abandoned
	SeekDB AI-Assisted	2025	Relational, Vector	Apache v2	AI-Assisted
	SenseiDB Abandoned	2012	Relational	Apache v2	Abandoned
	SereneDB OLAP OLTP Search Engine AI-Assisted	2024	Relational	Apache v2	OLAP OLTP Search Engine AI-Assisted
	ShardingSphere AI-Assisted	2016	Relational	Apache v2	AI-Assisted
	Sirius OLAP Query Engine AI-Assisted	2024	Relational	Apache v2	OLAP Query Engine AI-Assisted
	Sklad NoSQL	2024	Key/Value	Apache v2	NoSQL
	SlateDB AI-Assisted	2024	Key/Value	Apache v2	AI-Assisted
	Sled	2016	Key/Value	Apache v2
SL	Slumber DB Abandoned	2014	Key/Value	Apache v2	Abandoned
	SochDB AI-Assisted	2026	Graph, Relational, Vector	Apache v2	AI-Assisted
	Solr Search Engine NoSQL AI-Assisted	2004	Document / XML	Apache v2	Search Engine NoSQL AI-Assisted
SP	Sparkey Abandoned Immutable	2013	Key/Value	Apache v2	Abandoned Immutable
	Spark SQL OLAP AI-Assisted	2014	—	Apache v2	OLAP AI-Assisted
	SpiceDB Middleware AI-Assisted	2021	Object-Oriented	Apache v2	Middleware AI-Assisted
	SplinterDB NoSQL	2018	Key/Value	Apache v2	NoSQL
	StarRocks OLAP AI-Assisted	2021	Relational, Column Family / Wide-Column	Apache v2	OLAP AI-Assisted
	StereoDB OLTP	2023	Relational	Apache v2	OLTP
	Stig Abandoned Failed Company	2010	Graph	Apache v2	Abandoned Failed Company
	Stoolap OLAP OLTP	2025	Relational	Apache v2	OLAP OLTP
	Supabase OLTP AI-Assisted Hosting Service	2020	—	Apache v2	OLTP AI-Assisted Hosting Service
	Tajo OLAP Abandoned	2012	Relational	Apache v2	OLAP Abandoned
	TensorBase OLAP Abandoned Failed Company	2020	Relational	Apache v2	OLAP Abandoned Failed Company
	TerarkDB Forked Code Acquired Company	2016	Key/Value	Apache v2	Forked Code Acquired Company
	Terrastore Abandoned	2009	Document / XML	Apache v2	Abandoned
	TiDB NewSQL AI-Assisted	2015	Key/Value	Apache v2	NewSQL AI-Assisted
	TigerBeetle	2020	Relational	Apache v2
	TiKV AI-Assisted	2016	Key/Value	Apache v2	AI-Assisted
	Timbala Time-Series Abandoned	2016	Relational	Apache v2	Time-Series Abandoned
	TimescaleDB Time-Series AI-Assisted	2017	Relational	Apache v2	Time-Series AI-Assisted
	Titan Acquired Company Abandoned	2012	Graph	Apache v2	Acquired Company Abandoned
TI	Titan Abandoned	2018	—	Apache v2	Abandoned
	Tkrzw DBM	2020	Key/Value	Apache v2	DBM
	TokuMX Forked Code Acquired Company Abandoned	2013	Document / XML	Apache v2	Forked Code Acquired Company Abandoned
	TomP2P Abandoned	2004	Key/Value	Apache v2	Abandoned
	Tonbo OLTP AI-Assisted	2024	Key/Value	Apache v2	OLTP AI-Assisted
	ToplingDB Forked Code AI-Assisted	2021	Key/Value	Apache v2	Forked Code AI-Assisted
	toyDB	2019	Relational	Apache v2
	Trafodion Abandoned	2014	Column Family / Wide-Column	Apache v2	Abandoned
	TreodeDB Abandoned	2012	Key/Value	Apache v2	Abandoned
	Trino AI-Assisted	2019	—	Apache v2	AI-Assisted
	TuGraph	2021	Graph	Apache v2
	Twig	2009	Object-Oriented	Apache v2
	UnisonDB Multi-Model	2025	Column Family / Wide-Column, Key/Value	Apache v2	Multi-Model
	UnumDB Abandoned Failed Company	2015	Document / XML, Graph, Key/Value, Array / Matrix	Apache v2	Abandoned Failed Company
	upscaledb OLAP Abandoned	2007	Key/Value	Apache v2	OLAP Abandoned
	Vald Nearest Neighbor Search Engine AI-Assisted	2019	Vector	Apache v2	Nearest Neighbor Search Engine AI-Assisted
	VanillaDB Abandoned	2016	Multi-Value	Apache v2	Abandoned
	Vearch Nearest Neighbor Search Engine	2019	Document / XML, Vector	Apache v2	Nearest Neighbor Search Engine
	VectorDB Abandoned Nearest Neighbor	2023	Document / XML, Vector	Apache v2	Abandoned Nearest Neighbor
	VectorSQL OLAP Abandoned	2020	Relational	Apache v2	OLAP Abandoned
	Velox OLAP Query Engine AI-Assisted	2020	Relational	Apache v2	OLAP Query Engine AI-Assisted
	VennDB	2023	Relational	Apache v2
	Vespa Search Engine AI-Assisted	1997	Document / XML	Apache v2	Search Engine AI-Assisted
	VictoriaMetrics Time-Series AI-Assisted	2018	Column Family / Wide-Column	Apache v2	Time-Series AI-Assisted
	Vitess Middleware AI-Assisted	2011	Relational	Apache v2	Middleware AI-Assisted
	ViyaDB OLAP Abandoned	2017	Relational	Apache v2	OLAP Abandoned
	Voldemort Abandoned NoSQL	2009	Key/Value	Apache v2	Abandoned NoSQL
	WarehousePG Forked Code AI-Assisted	2025	Relational	Apache v2	Forked Code AI-Assisted
	Warp 10 Time-Series	2013	—	Apache v2	Time-Series
	XAP	2000	Key/Value	Apache v2
	Xata Forked Code AI-Assisted	2020	Relational	Apache v2	Forked Code AI-Assisted
	Xodus	2014	Document / XML	Apache v2
	YDB NewSQL OLTP AI-Assisted	2014	Relational	Apache v2	NewSQL OLTP AI-Assisted
	YouTrackDB Forked Code AI-Assisted	2024	Graph	Apache v2	Forked Code AI-Assisted
	YugabyteDB Forked Code OLTP AI-Assisted	2016	Key/Value, Relational	Apache v2	Forked Code OLTP AI-Assisted
	Zookeeper	2008	Hierarchical	Apache v2
	Zvec Nearest Neighbor AI-Assisted	2023	Vector	Apache v2	Nearest Neighbor AI-Assisted