Neo4j

Neo4j, is a labelled, property graph database with a native engine that is targeted at operational and hybrid operational/transactional and analytic use cases.

MongoDB

MongoDB is an open source, distributed, NoSQL document-oriented database that stores JSON documents.

MemSQL

MemSQL is a scale-out distributed, relational database, with a lock-free architecture that supports both row and column storage.

MariaDB Platform X3

MariaDB Platform X3 is an offering that combines the transactional capabilities of MariaDB TX with the analytic functionality provided by MariaDB AX.