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.
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.