RethinkDB – Free Intuitive Database with Modern UI
RethinkDB is an open-source distributed database built with love. You can enjoy an intuitive query language, automatically parallelized queries, and simple administration. RethinkDB is a great choice if you need flexible schemas, value ease of use, and are planning to run anywhere from a single node to a sixteen-node cluster.
RethinkDB is built to store JSON documents, and scale to multiple machines with very little effort. It has a pleasant query language that supports really useful queries like table joins and group by, and is easy to setup and learn.
License: AGPL License