Natural Language Toolkit (NLTK) nltk.org

Authors: Steven Bird <stevenbird1@gmail.com> Edward Loper <edloper@gmail.com> Ewan Klein <ewan@inf.ed.ac.uk>

Copyright (C) 2001-2013 NLTK Project

For license information, see LICENSE

NLTK -- the Natural Language Toolkit -- is a suite of open source Python modules, data sets and tutorials supporting research and development in Natural Language Processing.

Documentation: A substantial amount of documentation about how to use NLTK, including a textbook and API documention, is available from the NLTK website: http://nltk.org/

• The book covers a wide range of introductory topics in NLP, and shows how to do all the processing tasks using the toolkit.
• The toolkit's reference documentation describes every module, interface, class, method, function, and variable in the toolkit. This documentation should be useful to both users and developers.

Mailing Lists: There are several mailing lists associated with NLTK:

• nltk: Public information and announcements about NLTK (very low volume) http://groups.google.com/group/nltk
• nltk-users: Discussions amongst NLTK users http://groups.google.com/group/nltk-users
• nltk-dev: Discussions amongst NLTK developers http://groups.google.com/group/nltk-dev
• nltk-translation: Discussions about translating the NLTK book http://groups.google.com/group/nltk-translation
• nltk-commits: Subversion commit logs for NLTK http://groups.google.com/group/nltk-commits

Contributing: If you would like to contribute to NLTK, please see http://nltk.org/contribute

Donating: Have you found the toolkit helpful? Please support NLTK development by donating to the project via PayPal, using the link on the NLTK homepage.

Redistributing: NLTK source code is distributed under the Apache 2.0 License. NLTK documentation is distributed under the Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States license. NLTK corpora are provided under the terms given in the README file for each corpus; all are redistributable, and available for non-commercial use. NLTK may be freely redistributed, subject to the provisions of these licenses.

Citing: If you publish work that uses NLTK, please cite the NLTK book, as follows:

Bird, Steven, Edward Loper and Ewan Klein (2009).
Natural Language Processing with Python.  O'Reilly Media Inc.