Titan is a graph DBMS optimized for storing and querying graphs distributed across a multi-machine cluster.
Graph
http://titandb.io/
https://github.com/thinkaurelius/titan/
http://s3.thinkaurelius.com/docs/titan/1.0.0/
Aurelius
US
2012
DataStax
Open Source
Java
Berkeley DB, Cassandra, Elasticsearch, HBase
Apache v2