I could be wrong but the only other database I've been able to find, with the ability to subscribe to events, is GunDB (http://gun.js.org/ http://gun.js.org/).

I could be wrong but the only other database I've been able to find, with the ability to subscribe to events, is GunDB (http://gun.js.org/ http://gun.js.org/). The only other option is to put something in front of a DB like FeathersJS, or deepstream.io RethinkDB is a breath of fresh air and I really hope the community will be able to keep it alive.