Xitrum is an async and clustered Scala web framework and HTTP(S) server fusion on top of Netty, Akka, and Hazelcast.

+--------------------+
|      Your app      |
+--------------------+
|        Xitrum      |
| +----------------+ |
| | Web framework  | |  <-- Akka, Hazelcast --> Other instances
| |----------------| |
| | HTTP(S) Server | |
| +----------------+ |
+--------------------+
|       Netty        |
+--------------------+

Please see Xitrum home page.