RethinkDB is targeted at soft real time applications which have a need to update data across many clients. Additionally, although its a schemaless document DB,

RethinkDB is targeted at soft real time applications which have a need to update data across many clients. Additionally, although its a schemaless document DB, it offers functionality similar to joins/relational queries. This is a good presentation on RethinkDB: https://www.youtube.com/watch?v=Ee1v_SuECRk https://www.youtube.com/watch?v=Ee1v_SuECRk