I'm actually building one right now using Scala + skinny-micro-framework [1] + Slick and it's going pretty well. Very nicely composable, easy to work with Futu

I'm actually building one right now using Scala + skinny-micro-framework [1] + Slick and it's going pretty well. Very nicely composable, easy to work with Futures (unlike Scalatra) and very easy to extend to handle new types globally. (Just added an `Option -> response getOrElse 404` and if I need it I can add `actorRef -> Future -> rest-of-pipeline` too.). http4s and rho also look interesting, but they suffer from the magic operator soup that made dispatch a pain to work with (IMO). [1]: https://github.com/skinny-framework/skinny-micro https://github.com/skinny-framework/skinny-micro