To build on Rex's answer I would like to add some Scala libraries/products that may be of interest to you:
- ADAM
- Spark (sparkseq, 2)
- Scala Map Reduce (SMR): http://scala-blogs.org/2008/09/scalable-language-and-scalable.html
- SHadoop: http://jonhnny-weslley.blogspot.com/2008/05/shadoop.html
- ScalaLab: MATLAB-like scientific computing in Scala
- ScalaNLP: Collection of libraries for natural language processing (NLP), machine learning, and statistics.
- Factorie: Toolkit for deployable probabilistic modeling
- Gridgain: Compute cluster for Scala and Java
- BioScala: Bioinformatics for the Scala programming language
