JanusGraph

Open source, distributed, highly scalable graph database

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Hunter's comment

JanusGraph, the TitanDB fork, is developed as a project of the Linux Foundation. It is a massively scalable, distributed graph database that:

• is optimized for storing and querying graphs containing hundreds of billions of vertices and edges distributed across a multi-machine cluster.
• supports thousands of concurrent users executing complex graph traversals in real time.
• supports variety of visualization tools like Arcade Analytics, Cytoscape, Gephi plugin for Apache TinkerPop, Graphexp, Key Lines by Cambridge Intelligence, Linkurious and Tom Sawyer Perspectives
  Source.

Link

https://janusgraph.org