Guys, check out https://github.com/deepstreamIO - open source MIT - I've been a long time user and it works great. It's a typescript code base, very readable and straight forward, uses protocol buffers for messaging and uWebSockets.js for the websocket server (ultra fast). You get realtime records, pub/sub, events, rpc, fine grained permissions, http endpoints and basically you can hook up to any backend (currently there are connectors for postgres, rethinkdb, elastic and others).

We need more people to use it, cause the original developer is going on maintenance mode and we're trying to strengthen the community. It rocks!