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Natural Language Toolkit

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Natural Language Toolkit
The NL Toolkit simplifies the construction of programs that process natural language and defines standard interfaces between the different components of an NLP system. NLTK includes graphical demonstrations, sample data, tutorials, and API documentation.


User tutorials available in HTML format from; API doumentation available in HTML format from


Download version 1.1 (stable)
released on 19 August 2003

VCS Checkout


Related Projects


LicenseVerified byVerified onNotes
GPLv2Janet Casey19 August 2003

Leaders and contributors

Edward Loper Maintainer

Resources and communication

Audience Resource type URI
Developer VCS Repository Webview
Help Mailing List Info/Archive
Developer Mailing List Info/Archive

Software prerequisites

Kind Description
Required to use Python 2.1 or later
Weak prerequisite Tkinter (to use the GUI toolkit)
Weak prerequisite Numeric (adds fast array facility)

This entry (in part or in whole) was last reviewed on 15 September 2003.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.

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