Neo4j by Roberto Zicari · Published January 1, 2010 · Updated February 16, 2014 Neo4j: a high performance open-source embeddable or standalone graph database. Good integration via Java, Grails, PHP, .NET, REST, Rubyetc. High Availability and Online-backup available. LINK
Pypher gets property map, map, and map projection support May 7, 2018 by Roberto Zicari · Published May 7, 2018
Neo4J On StackOverflow: Promise.all(), cartesian products, APOC September 27, 2017 by Roberto Zicari · Published September 27, 2017
OrientDB January 1, 2010 by Roberto Zicari · Published January 1, 2010 · Last modified February 16, 2014