AFGL Project: Affix Grammars over a Finite Lattice
- A system of public domain software for natural language processing. Includes a formalism for compact grammar description, parser generation system, transduction tool.
- http://www.agfl.cs.ru.nl/

Connexor Parsers
- Language parsers and taggers for English, German, French, Spanish, Italian, Dutch, Finnish and Swedish. On-line parser demos and limited documentation available.
- http://www.connexor.com/

OpenNLP
- Collaborative organization for open source projects related to natural language processing. Lists ongoing projects and documents proposed standard Java and XML APIs.
- http://opennlp.sourceforge.net/

Senga: Information Retrieval Software
- Senga is a development group focused on information retrieval software. The primary purpose of the components distributed on Senga is to build a large scale internet search engine.
- http://www.senga.org

GroupLens
- An experimental collaborative filtering service based on "Better Bit Bureaus" which is itself a collaborative venture between Paul Resnik of the Center for Coordination Science at MIT and Brad Miller and others at the University of Minne
- http://www.cs.umn.edu/Research/GroupLens/

KPML Access Page
- Graphically based language engineering program, developed for working with large-scale grammars under the Systemic Formal Linguistics framework. Downloadable program images, documentation, resources and source code.
- http://www.fb10.uni-bremen.de/anglistik/langpro/kpml/README.html

Morphological and Orthographic Tools for English
- UNIX tools for the analysis and synthesis of text, from Sussex's John Carroll. GZIP downloads, descriptions, related publications.
- http://www.cogs.susx.ac.uk/lab/nlp/carroll/morph.html

Annotate
- Tool for semi-automatic graphic annotation of corpora. License, documentation, screenshot. Requires GCC and MySQL, in addition to registration.
- http://www.coli.uni-sb.de/sfb378/negra-corpus/annotate.html

Public Domain Language Engineering Generic Tools
- Lecture by Tomaz Erjavec, including text, slides and links. From the 1996 TELRI conference.
- http://nl.ijs.si/telri/pub-tools/

Cogilex
- Company offering expert services and customized tools for natural language processing. Site features demo download of the "QuickTag and QuickParse" utility for Windows, also online tools.
- http://www.cogilex.com

TextAI: Text Analysis International
- Provides NLP applications based on its proprietary VisualText technology. Product and service information, online software tour, some documentation.
- http://www.textanalysis.com/

GATE: General Architecture for Text Engineering
- A computer architecture for a broad range of Natural Language Processing tasks, available under the GNU Public License. Abundant documentation, Java class library, web-based demos.
- http://www.gate.ac.uk/

Natural Language Software Registry
- A directory of academic, commercial and proprietary software with specifications and licensing terms. From DFKI Saarbrücken.
- http://registry.dfki.de/

ARIES Natural Language Tools
- Proprietary tools for the lexical work on the Spanish language. Free demo, documentation.
- http://www.mat.upm.es/~aries/description.html