Old version, no longer maintained: 3.2.14 Old version, no longer maintained: 3.0.12 Old version, no longer maintained: 2.3.12 Old version, no longer maintained: 2.2.10 In June 2021, Neo4j announced another round of funding, $325M in Series F. In November 2018, Neo4j successfully secured $80M in Series E Funding led by One Peak Partners and Morgan Stanley Expansion Capital, with participation from other investors including Creandum, Eight Roads and Greenbridge Partners. In November 2016, Neo4j successfully secured $36M in Series D Funding led by Greenbridge Partners Ltd. Neo4j version 3.0 was released in April 2016. Neo4j version 2.0 was released in December 2013.

Version 1.0 was released in February 2010.

The '4j' in Neo4j is a reference to its being built in Java, however is now largely viewed as an anachronism. 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.

Neo also licenses Neo4j with these extensions under closed-source commercial terms. 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. Neo4j is a graph database management system developed by Neo4j, Inc.

Source code: GPLv3 and AGPLv3 with Commons Clause.

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