Titan – A Scalable Distributed Graph Database

Titan is a scalable graph database optimized for storing and querying graphs containing hundreds of billions of vertices and edges distributed across a multi-machine cluster. Titan is a transactional database that can support thousands of concurrent users executing complex graph traversals in real time.

Requirements: –
Demo: http://thinkaurelius.github.io/titan/
License: Apache 2.0 License