Textable is an open source program for text analysis. It offers a set of basic text-analytic components (e.g. import text from files, segment into words, measure segment diversity, etc.), which the user combines using a visual interface to build custom analytic workflows.
A number of ready-made recipes are made available on Textable's website to help users get started with the program. A complete list of features can be found there too.
The program is distributed in the form of an add-on to the Orange Canvas data mining software package (also open source). This enables the user to access a wide range of data mining algorithms such as clustering, supervised classification, factor analyses, and visualizations.