Cayley is an open-source graph database query engine inspired by the Freebase and Google's Knowledge Graph systems.
GraphQL Gremlin
Triplestore / RDF
https://cayley.io/
https://github.com/cayleygraph/cayley
Google
US
2014
Open Source
Go
BoltDB, CockroachDB, CouchDB, Elasticsearch, MySQL, PostgreSQL
Apache v2