JanusGraph is a graph DBMS optimized for storing and querying graphs distributed across a multi-machine cluster.
Originally called Titan. It was renamed to JanusGraph in 2015.
Graph
http://janusgraph.org
https://github.com/JanusGraph/janusgraph/
https://docs.janusgraph.org/latest/
The Linux Foundation
US
2012
Titan
DataStax
Open Source
Java
Berkeley DB, Cassandra, Elasticsearch, HBase
Apache v2