Cayley is an open-source database for Linked Data. It is inspired by the graph database behind Google's Knowledge Graph (formerly Freebase).
Documentation
Features
- Built-in query editor, visualizer and REPL
 - Multiple query languages:
 - Modular: easy to connect to your favorite programming languages and back-end stores
 - Production ready: well tested and used by various companies for their production workloads
 - Fast: optimized specifically for usage in applications
 
Performance
Rough performance testing shows that, on 2014 consumer hardware and an average disk, 134m quads in LevelDB is no problem and a multi-hop intersection query -- films starring X and Y -- takes ~150ms.
Community
- Website: cayley.io
 - Slack: cayleygraph.slack.com -- Invite here
 - Discourse list: discourse.cayley.io (Also acts as mailing list, enable mailing list mode)
 - Twitter: @cayleygraph
 - Involvement: Contribute