Graph Database in Java (other than Neo4J)

Question

Greetings,
Is there any open source graph database available other than Neo4J??

NOTE: Why not Neo4J?
Neo4J is openso

Answer 1

Also take a look at ArrangoDB. A lovely multi-model database.

https://www.arangodb.com/

EDIT : Must say that I'm falling more and more in love with Arrango :)