n8han/giter8. And another practical tool, not necessarily Scala-related, but very useful: templates stored on GitHub are used to set up project structures. There is also a template for Android projects that use Scala.
Getting started · jberkel/android-plugin Wiki. And here is the central element for Scala programming for Android. This provides various sbt commands that handle Android integration and delivery.
mpeltonen/sbt-idea. Hmm, interesting - an sbt plugin with which you can generate Idea project structures. With this, you can then use the IDE at the points where you want to use it on the same project. For example, for remote debug integration, the IDE is quite nice.
Android programming with Scala. A bit stilted language, but useful content. The article provides a nice overview of what you gain when using Scala for Android programming. I need to take a closer look at this myself, as typing in Java sometimes gets on my nerves. Additionally, a workflow with sbt and a normal editor sounds much leaner than the various Java IDE environments. And some Scala language features practically scream to be used in the Android environment (especially traits).
Postbox — Awesome Email. I was never really enthusiastic about Thunderbird, so the announcement that it would no longer be developed didn't bother me much. But the fact that Sparrow now belongs to Google and, according to the announcements, nothing more is to be expected from it, really annoyed me - it was one of the faster clients for gmail and also had usable feature support for it. The Apple Mail client is rather stiff in comparison. Postbox claims to support gmail features, so it might be worth a try if Sparrow can no longer be used reliably due to bit rot.