Neo4j

Neo4j is a Java-based open source graph database. The developers describe Neo4j as an embedded, disk-based, transactional database engine, the data in tables rather than in graph structured stores. Neo4j version 1.0 was released in February 2010. The Community Edition of the database is licensed under the GNU General Public License ( GPL) v3. Additional modules such as online backup and high availability are licensed under the GNU Affero General Public License ( AGPL ) v3. The database and the add-on modules are available in a dual licensing model also under a commercial license. Neo4j is the most popular graph database.

Neo4j has been developed by Neo Technology, a startup company based in Malmö / Sweden and San Francisco Bay / USA. Members of the Board of Neo Technology are Magnus Christerson (Deputy Chairman of Intentional Software Corp.)., Nikolaj Nyholm ( CEO of Polar Rose), Sami Ahvenniemi ( Partner at Conor Venture Partners ) and Johan Svensson (Technical Director of Neo Technology ).