There is also a very cool sample using GridFS for storing and streaming files https://github.com/sgodbillon/reactivemongo-demo-app

This new driver mixed with Play2 fully non-blocking/asynchronous stack opens very interesting fields of exploration and was really something missing till now in JVM world...

or stream a live tailable collection through websocket https://github.com/sgodbillon/reactivemongo-tailablecursor-d... :)