scalaxb is an XML data binding tool for Scala.
Gigahorse is an HTTP client for Scala with multiple backend support.
treehugger.scala is a library to code Scala programmatically.
Power assertions (as known from Groovy and Spock) for the Scala language.
a typeclass based JSON codec that's backend independent
an experimental Scala extension of Jar Jar Links
an app to download Scala docs.