https://github.com/cayleygraph/cayley

Go
An open-source graph database

Cayley is an open-source graph inspired by the graph database behind Freebase and Google's Knowledge Graph.

Its goal is to be a part of the developer's toolbox where Linked Data and graph-shaped data (semantic webs, social networks, etc) in general are concerned.

Features

• Community driven
• Written in Go
  • can be used as a Go library
• Easy to get running (3 or 4 commands, below)
• RESTful API
  • or a REPL if you prefer
• Built-in query editor and visualizer
• Multiple query languages:
  • Gizmo - a JavaScript, with a Gremlin-inspired* graph object.
  • GraphQL-inspired* query language.
  • (simplified) MQL, for Freebase fans
• Plays well with multiple backend stores:
  • LevelDB
  • Bolt
  • PostgreSQL
  • MongoDB for distributed stores
  • In-memory, ephemeral
• Modular design; easy to extend with new languages and backends
• Good test coverage
• Speed, where possible.

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

Documentation

• See the docs folder