Apache Mahout - Distributed Linear Algebra
Tableau - Tableau can help anyone see and understand their data. Connect to almost any database, drag and drop to create visualizations, and share with a click.
KNIME - KNIME, the open platform for your data.
June - Instant analytics reports, built on top of Segment
WEKA - WEKA is a set of powerful data mining tools that run on Java.
Maptiks - Analytics for web map applications