Proteus Project - doing Natural Language Processing (NLP) research at New York University since the 1960's.
SIGPARSE - SIGPARSE is a special interest group of the ACL (Association for Computational Linguistics). The group consists of about 200 researchers whose research interests are in various aspects of parsing natural language.
The Stanford NLP Group - The NLP Group at Stanford University works on algorithms that allow computers to process and understand human languages. Their work ranges from basic research in computational linguistics to key applications in human language technology, and covers areas such as sentence understanding, probabilistic parsing and tagging, biomedical information extraction, grammar induction, word sense disambiguation, and automatic question answering.