1. SprayA suite of scala libraries for building and consuming RESTful web services on top of Akka: lightweight, asynchronous, non-blocking, actor-based, testable
2. TwirlThe Play framework Scala template engine, stand-alone and packaged as an SBT plugin
3. Spray CanA low-overhead, high-performance, fully async HTTP 1.1 server and client library implemented entirely in Scala on top of Akka
4. Spray JsonA lightweight, clean and simple JSON implementation in Scala
5. Sbt RevolverAn SBT plugin for dangerously fast development turnaround in Scala