OrientDB is a multi-model NoSQL DBMS that supports of graph, documents, geo-spatial, and object-oriented storage.
B+Tree Hash Table K-D Tree Inverted Index (Full Text)
http://www.orientdb.org/
https://github.com/orientechnologies/orientdb
OrientDB Ltd
GB
2010
Commercial, Open Source
Java
Apache v2
https://en.wikipedia.org/wiki/OrientDB