- Basic-English-Grammar - Basic-English-Grammar is a lisp system for working with the English grammar data from the
- CL-ACE - CL-ACE is a set of bindings for various Attempto Tools, and is maintained by Joshua Taylor
- CL-EARLEY-PARSER - The Earley parser depends on a grammar description (currently in Backus-Naur form) and a lexicon (currently in a plist like form)
- Epilog System and Episodic Logic - In contrast to Epilog Inference Package, the original Epilog system was created by Schubert, Hwang and Schaeffer for Knowledge Representation in Natural Language Processing, and is documented at the University of Rochester's Web.
- langutils - langutils is a Common Lisp Natural Language Processing library which provides a set of functions related to the structured analysis and processing of open English text, written by Ian Eslick and now maintained by Kevin Raison and based in part on Python code from Hugo Liu.
- lassie - Natural Language Processing library for Latent Semantic Indexing
- Soundex - The Soundex algorithm indexes words by their sound when pronounced in English, for example to account for differences in spelling
Natural Language Processing
Natural Language Processing is a subcategory of AI, consisting of a set of algorithms, theories and techniques used to process natural language (that spoken by humans) on computers.