Neo4j

Source code: GPLv3 and AGPLv3 with Commons Clause
Binaries: Freemium registerware

Neo4j
Developer(s)	Neo4j
Initial release	2007
Stable release	5.16 / 22 January 2024
Repository	github.com/neo4j/neo4j ;
Written in	Java
Type	Graph database
License	Source code: GPLv3 and AGPLv3 with Commons Clause; Binaries: Freemium registerware;
Website	neo4j.com

Neo4j is a graph database management system developed by Neo4j, Inc.

The data elements Neo4j stores are nodes, edges connecting them, and attributes of nodes and edges. Described by its developers as an ACID-compliant transactional database with native graph storage and processing, Neo4j is available in a non-open-source "community edition" licensed with a modification of the GNU General Public License, with online backup and high availability extensions licensed under a closed-source commercial license. Neo also licenses Neo4j with these extensions under closed-source commercial terms.

Neo4j is implemented in Java and accessible from software written in other languages using the Cypher query language through a transactional HTTP endpoint, or through the binary "Bolt" protocol. The "4j" in Neo4j is a reference to its being built in Java, however is now largely viewed as an anachronism.

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