Ontotext Announces New Free Version Of GraphDB The new GraphDB ver. 6.6 introduces GraphDB Free - a fully-functional free edition of the industry leading semantic graph database engine December 03, 2015 09:39 ET | Source: Ontotext NEW YORK and SOFIA, Bulgaria, Dec. 3, 2015 (GLOBE NEWSWIRE) -- Ontotext, the developer of GraphDB™, is excited to announce a new addition to the GraphDB family of produc