Scala is a programming language. A fairly outdated version is available in Debian. A bare-bones but more up-to-date package can be obtained from TypeSafe (replace 'tgz' with 'deb' yourself if it doesn't autodetect your OS).
The mailing list for discussions about packaging Scala and related software is pkg-scala-maint.
The following software should also be packaged for Debian. If you fill an RFP/ITP bug, please add the link to it here!
Basic language tools
maven-scala-plugin RFP: 572737
IDE integration, Editor support
scala-tool-support (for gedit, genscript, jEdit, Scite, TextPad, UltraEdit, VIM), apparently only available via svn export http://lampsvn.epfl.ch/svn-repos/scala/scala-tool-support/trunk/src scala-tool-support
Common libraries, frameworks