Play Framework[1] (in Scala, its also available in Java): * I like programming in Scala * Play is built on Akka[2] (a lot of people use Akka instead of using a full-on framework) * Great testing suite * The documentation is very good * Most components of the framework can be used separately, for example Play has a good asynchronous http client that I use in other projects

[1]: https://www.playframework.com [2]: http://akka.io