PyMVPA is a Python package intended to ease statistical learning analyses of large datasets. It offers an extensible framework with a high-level interface to a broad range of algorithms for classification, regression, feature selection, data import and export. While it is not limited to the neuroimaging domain, it is eminently suited for such datasets. PyMVPA is truly free software (in every respect) and additionally requires nothing but free-software to run.
MIT License, also the X Consortium License, or a derivative; see: http://www.opensource.org/licenses/mit-license.php
The MIT license is fairly permissive, placing few restrictions on the developer or user. As a developer, you may distribute source or binaries (with or without source code). As a tool user, you may modify and redistribute this tool or resource. If source code is distributed, a user may browse the source code to understand the tool's workings, modify the tool to better suit local needs, and may share a modified version. If source code is not distributed, a user may still redistribute the tool as part of another package.