The LightSide Researcher's Workbench is an open-source text-mining tool released under the GNU General Public License.
To download the latest public release, visit http://ankara.lti.cs.cmu.edu/side.
copyright/gpl.txt for more information.
To build from source, use ant:
This will compile the workbench and run a modest set of unit tests.
To add new feature-extraction, machine-learning, or analysis tools to the workbench, you'll want to write a plugin. See the appendix in the Researcher's Manual for more information, and the core LightSide plugins repository for examples.