KNIME - The Konstanz Information Miner

KNIME is a graphical compute workflow tool based on the Eclipse framework. It is available for free as well as with commercial support. What you basically have is a drawing board where you visually design your compute workflow (similar to WEKA). You can drag and drop and connect different nodes. Nodes are representing some functionality of your workflow. There are nodes for reading data from databases or files, nodes for doing some calculations like data clustering, and nodes for handling output or to visualize the results. The enterprise edition has capabilities to exploit a compute cluster by submitting jobs to Univa Grid Engine.