neo4j
1.2.6-java
You can think of Neo4j as a high-performance graph engine with all the features of a mature and robust database. The programmer works with an object-oriented, flexible network structure rather than with strict and static tables yet enjoys all the benefits of a fully transactional, enterprise-strength database. It comes included with the Apache Lucene document database.
installgem install neo4j -v 1.2.6
