Topicalizer is a suite of text analysis and information extraction tools.
It used to be available under http://www.topicalizer.com. However, I unfortunately don't have any time any more to properly maintain it, which is why I'm open-sourcing the code for others to learn from and build upon.
Topicalizer was a TurboGears application, which is why the source code contains some stuff that's specific to that particular framework. I've tried to remove most of the boilerplate code, though.
Topicalizer is released under the MIT license: