Databases for Knowledge graph

The default property-graph database, with Cypher, a big ecosystem and a managed cloud.

Native multi-model database: documents, graphs, search and vectors behind one query language.

Low-latency graph database using sparse matrices, the maintained successor to RedisGraph.

Early Java multi-model database mixing documents, graphs and objects, now in patch-only mode.

Strongly typed entity-relation database with TypeQL, polymorphic queries and a Rust core.

Open-source distributed graph database layered on Cassandra, HBase, ScyllaDB or Bigtable.

In-memory, Cypher-compatible graph database in C++ for streaming and real-time graph workloads.

Distributed, horizontally scalable graph database in Go with native GraphQL and DQL.

Git-for-data document and knowledge-graph database with branches, diffs and time travel.

Community-maintained continuation of Kùzu: embedded columnar graph database with Cypher.

PostgreSQL extension that adds openCypher graph queries alongside SQL.

Hybrid SQL/RDF engine that runs many of the largest public SPARQL endpoints.

Apache Jena's native RDF store, embeddable in Java or served over SPARQL with Fuseki.

Shared-nothing distributed graph database for trillion-edge graphs, with GQL in Enterprise v5.

Fast open-source SPARQL engine that serves all of Wikidata or OpenStreetMap from one machine.

Distributed MPP graph database built for deep-link analytics on very large graphs.

Lisp-built RDF and document knowledge graph with vector store, reasoning and LLM agents.

Standards-compliant RDF triplestore with reasoning, connectors and MCP support for GraphRAG.

AWS's managed graph database speaking Gremlin, openCypher and SPARQL on shared storage.

Small, fast SPARQL database in Rust that embeds in Rust, Python and JavaScript or runs as a server.

Immutable in-memory database with Datomic-style Datalog queries for Clojure, ClojureScript and JavaScript.

Multi-model Java database speaking SQL, Cypher, Gremlin, MongoDB and Redis protocols.

Embedded Datalog database blending relational, graph and vector queries; dormant since 2024.

Enterprise knowledge-graph platform: RDF store, reasoning and virtual graphs over your sources.

Eclipse Foundation's Java RDF framework with native, LMDB and in-memory SPARQL stores.

Go graph database inspired by Google's Knowledge Graph, dormant since its 2019 release.

Apache graph database from Baidu with Gremlin and Cypher, pluggable backends and a distributed store.

PostgreSQL fork with a built-in property graph model, mixing SQL, openCypher and ISO GQL.

Ant Group's open-source C++ graph database with ACID transactions, Cypher and LDBC-record performance.

Immutable RDF graph database with time travel, git-style branching, SPARQL, JSON-LD and Cypher.

In-memory RDF store with incremental Datalog reasoning, now owned by Samsung.

Lightweight Go graph database with GraphQL, an SQL-like query language, full-text search and scripting.

MIT-licensed RDF triple store for .NET with SPARQL and a LINQ-based entity framework; dormant since 2020.

Embedded Java hypergraph database where edges can link any number of atoms, including other edges.

MPP in-memory RDF graph database for OLAP-style SPARQL analytics, now Altair Graph Lakehouse under Siemens.

Clustered RDF quad store in C, built at Garlik for billions of triples; now receives only rare fixes.

Web-based relaxed-schema graph data manager for humanities researchers, built on Django over Neo4j.

Memory-optimized AWS graph engine for fast algorithms, openCypher and vector search over large graphs.

Hosted RDF triple store with SPARQL 1.1, valid-time indexing and an MCP endpoint on every repository.

Chinese native distributed graph database for HTAP graph workloads in banking and energy.

FactNexus's commercial graph DBMS that treats whole graphs as transactional units for knowledge graphs.

Managed hosting for Neo4j Community Edition on dedicated cloud instances, with backups and replicas.

Small Windows RDF store with SPARQL, SPARQL/Update and Datalog rule inference, embeddable via Lua or DLL.

Commercial distributed graph database marketed as built natively for ISO GQL.

Enterprise multi-model database for XML, JSON and RDF with built-in search and semantic RAG.

Open-source, durable Datalog database for Clojure with Datomic-style immutable history.

Deductive object base for metamodeling, built on O-Telos with Datalog rules and unlimited meta-levels.

SAP's in-memory columnar HTAP database, the mandatory engine under S/4HANA.

Immutable Datalog database from Nubank where every fact is timestamped and queries run in the app process.