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.
Histograph is a graph-based exploration and crowd-based indexation for multimedia collections. HistoGraph treats multimedia collections as networks. The underlying assumption is simple: if two people are mentioned together in a document, we assume that they may have something to do with each other.
DiscoverText allows users to import data from a variety of sources (including free and premium Gnip Twitter feeds, plain text, Word, Excel, public YouTube comments, blogs/wikis, PDF, etc.), to view, search, filter, deduplicate, code and machine classify the data. This is a collaborative, web-based platform widely used by academics.
TXM is a free and open-source cross-platform Unicode, XML & TEI based text analysis software, supporting Windows, Mac OS X and Linux. It is also available as a J2EE standard compliant portal software (GWT based) for online access with access control built in.