Linguistic Inquiry and Word Count (LIWC)
http://www.liwc.net/

Linguistic Inquiry and Word Count (LIWC) is a text analysis software program designed by James W. Pennebaker, Roger J. Booth, and Martha E. Francis. LIWC is able to calculate the degree to which people use different categories of words across a wide array of texts. Within emails, speeches, poems, or transcribed daily speech, LIWC allows you to determine the rate at which the authors/speakers use positive or negative emotion words, self-references, big words, or words that refer to sex, eating, or religion. The program was designed to analyze simply and quickly over 70 dimensions of language across hundreds of text samples in seconds. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.