What open source projects would you recommend for people to study to learn how the pros write Scala?

Some of the attributes that I'm looking for - though they don't all have to be present in every exemplary project:

  • Idiomatic use of the language and libraries
  • Functional programming techniques
  • Concurrency (using Actors or other methods)
  • Large scale system with many modules
  • Readability
  • Java interop
  • etc.

The Akka project can be interesting (but quite complex): source code.

You can combine that reading with the Scala Style guide.

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  • I've been looking at the Akka code recently. It is very nice. – sourcedelica Jun 30 '12 at 2:05

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