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Comment by eitland | Hacker News Reader

One of the most interesting part seems not to be mentioned: Apache license.

So far the only real, all-features-included graph database with a permissive open source license, - or am I missing something?

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Yeah, it's Apache 2.0 (https://github.com/thinkaurelius/titan/blob/master/LICENSE.t...), and it's the first native Blueprints implementation so it integrates with the entire TinkerPop stack (http://www.tinkerpop.com/), which is BSD.

Well, I am not a Big Data guy, so I don't know if it's "real" enough in terms of capabilities or maturity, but when looking for a graph database to mess around with, I came across OrientDB, which also uses the Apache license. Clearly it's not built for the same use cases or scale as Titan but it seems to have some case studies and commercial support. I haven't played with it yet, so I suppose the project could be an elaborate hoax.

http://www.orientdb.org/

No, OrientDB is not an "elaborate hoax" :) -- it's very real and developed by Luca Garulli (https://github.com/lvca). OrientDB is one of the primary Blueprints implementations (https://github.com/tinkerpop/blueprints) so it integrates with the TinkerPop stack as well.

Apache Jena is a graph database and has been an Apache project since 2011 and graduated from the incubator in Apr 2012

http://jena.apache.org/

One tangential direction we want to go with Titan is benchmarking it as a distributed RDF store. With edge indexing now in Titan 0.3.0 and Blueprints Sail (GraphSail), Titan can represent an RDF graph and be queried using SPARQL.

   https://github.com/tinkerpop/blueprints/wiki/Sail-Ouplementation

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