K Kùzu Inc. (company acquired; project archived) · NoSQL & key-value stores
In-depth entry Embedded property-graph database with Cypher, vector and full-text search; MIT-licensed but archived in October 2025 after the company was acquired
MIT Open source Free Local Discontinued Nov 2, 2026M MongoDB, Inc. · NoSQL & key-value stores
Document database storing BSON documents with a rich aggregation pipeline, available as a source-available Community Server or the managed Atlas service
SSPL-1.0 Free Freemium Self-hosted BrokenN Neo4j, Inc. · NoSQL & key-value stores
Native property-graph database queried with Cypher, offered as a GPL community edition, a commercial enterprise edition and the AuraDB cloud service
GPL-3.0 Open source Freemium Self-hosted Broken