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Play, with large components ripped out and rewritten. In particular, the monadic db access system is something we wrote in house.

I've been very impressed by Scala. Play is also very productive. IntelliJ has an excellent (free) Scala plugin and I've read that support for Play is coming in the next version: http://blog.jetbrains.com/scala/2012/07/20/play-2-0-support/