Mallet is a Java based library and command line framework that provides statistical and machine learning tools for use with natural language processing.

etcML (Easy Text Classification with Machine Learning) is a free text analysis tool from Stanford University that uses machine learning to identify positive and negative sentiments in texts. Users can analyze their own dataset, use a dataset provided with the tool, or search Twitter for keywords of interest.

Qualrus is a commercial application for qualitative data analysis, including data coding and statistics functions. It can analyze data from a wide variety of sources, including common text, web, image, video and audio files. The data coding functions are supplemented by machine learning processes to assist data processing and analysis. In terms of analysis, it offers a number of common text analysis functions including tokenization, co-occurences, and Boolean search, and can visualize a network view of interrelationships. It is particularly aimed at academic and institutional applications, and both student and free trial versions are avaiable.