VisTrails is an open-source data analysis and visualization tool. It provides a comprehensive provenance infrastructure that maintains detailed history information about the steps followed and data derived in the course of an exploratory task: VisTrails maintains provenance of data products, of the computational processes that derive these products and their executions.
Python
The UV-CDAT project uses a modified version of the VisTrails data analysis tool for its provenance-enabled persistence and execution needs.
Homepage: http://www.vistrails.org
This version was forked off a long time ago for UV-CDAT use. For VisTrails 2.0+ check out VisTrails/VisTrails.