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
Hetionet: an integrative network of disease June 28, 2017 by Roberto Zicari · Published June 28, 2017