What about TinkerGraph: <a href="http:&#x2F;&#x2F;tinkerpop.apache.org&#x2F;docs&#x2F;3.1.0-incubating&#x2F;#tinkergraph-gremlin" rel="nofollow">http:&#x2F;&#x2F;tinkerpop.apache.org&#x2F;docs&#x2F;3.1.0-incubating&#x2F;#tinkergra...</a><p>It is &quot;TinkerGraph is a single machine, in-memory (with optional persistence), non-transactional graph engine that provides both OLTP and OLAP functionality.&quot;