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# Natural Language Toolkit (NLTK) Authors
## Original Authors
- Steven Bird <stevenbird1@gmail.com>
- Edward Loper <edloper@gmail.com>
- Ewan Klein <ewan@inf.ed.ac.uk>
## Contributors
- Tom Aarsen
- Rami Al-Rfou'
- Mark Amery
- Greg Aumann
- Ivan Barria
- Ingolf Becker
- Yonatan Becker
- Paul Bedaride
- Steven Bethard
- Robert Berwick
- Dan Blanchard
- Nathan Bodenstab
- Alexander Böhm
- Francis Bond
- Paul Bone
- Jordan Boyd-Graber
- Daniel Blanchard
- Phil Blunsom
- Lars Buitinck
- Cristian Capdevila
- Steve Cassidy
- Chen-Fu Chiang
- Dmitry Chichkov
- Jinyoung Choi
- Andrew Clausen
- Lucas Champollion
- Graham Christensen
- Trevor Cohn
- David Coles
- Tom Conroy <https://github.com/tconroy>
- Claude Coulombe
- Lucas Cooper
- Robin Cooper
- Chris Crowner
- James Curran
- Arthur Darcet
- Dariel Dato-on
- Selina Dennis
- Leon Derczynski
- Alexis Dimitriadis
- Nikhil Dinesh
- Liang Dong
- David Doukhan
- Rebecca Dridan
- Pablo Duboue
- Long Duong
- Christian Federmann
- Campion Fellin
- Michelle Fullwood
- Dan Garrette
- Maciej Gawinecki
- Jean Mark Gawron
- Sumukh Ghodke
- Yoav Goldberg
- Michael Wayne Goodman
- Dougal Graham
- Brent Gray
- Simon Greenhill
- Clark Grubb
- Eduardo Pereira Habkost
- Masato Hagiwara
- Lauri Hallila
- Michael Hansen
- Yurie Hara
- Will Hardy
- Tyler Hartley
- Peter Hawkins
- Saimadhav Heblikar
- Fredrik Hedman
- Helder
- Michael Heilman
- Ofer Helman
- Christopher Hench
- Bruce Hill
- Amy Holland
- Kristy Hollingshead
- Marcus Huderle
- Baden Hughes
- Nancy Ide
- Rebecca Ingram
- Edward Ivanovic
- Thomas Jakobsen
- Nick Johnson
- Eric Kafe
- Piotr Kasprzyk
- Angelos Katharopoulos
- Sudharshan Kaushik
- Chris Koenig
- Mikhail Korobov
- Denis Krusko
- Ilia Kurenkov
- Stefano Lattarini
- Pierre-François Laquerre
- Stefano Lattarini
- Haejoong Lee
- Jackson Lee
- Max Leonov
- Chris Liechti
- Hyuckin David Lim
- Tom Lippincott
- Peter Ljunglöf
- Alex Louden
- David Lukeš
- Joseph Lynch
- Nitin Madnani
- Felipe Madrigal
- Bjørn Mæland
- Dean Malmgren
- Christopher Maloof
- Rob Malouf
- Iker Manterola
- Carl de Marcken
- Mitch Marcus
- Torsten Marek
- Robert Marshall
- Marius Mather
- Duncan McGreggor
- David McClosky
- Xinfan Meng
- Dmitrijs Milajevs
- Matt Miller
- Margaret Mitchell
- Tomonori Nagano
- Jason Narad
- Shari Aaidil Nasruddin
- Lance Nathan
- Morten Neergaard
- David Nemeskey
- Eric Nichols
- Joel Nothman
- Alireza Nourian
- Alexander Oleynikov
- Pierpaolo Pantone
- Ted Pedersen
- Jacob Perkins
- Alberto Planas
- Ondrej Platek
- Alessandro Presta
- Qi Liu
- Martin Thorsen Ranang
- Michael Recachinas
- Brandon Rhodes
- Joshua Ritterman
- Will Roberts
- Stuart Robinson
- Carlos Rodriguez
- Lorenzo Rubio
- Alex Rudnick
- Jussi Salmela
- Geoffrey Sampson
- Kepa Sarasola
- Kevin Scannell
- Nathan Schneider
- Rico Sennrich
- Thomas Skardal
- Eric Smith
- Lynn Soe
- Rob Speer
- Peter Spiller
- Richard Sproat
- Ceri Stagg
- Peter Stahl
- Oliver Steele
- Thomas Stieglmaier
- Jan Strunk
- Liling Tan
- Claire Taylor
- Louis Tiao
- Steven Tomcavage
- Tiago Tresoldi
- Marcus Uneson
- Yu Usami
- Petro Verkhogliad
- Peter Wang
- Zhe Wang
- Charlotte Wilson
- Chuck Wooters
- Steven Xu
- Beracah Yankama
- Lei Ye (叶磊)
- Patrick Ye
- Geraldine Sim Wei Ying
- Jason Yoder
- Thomas Zieglier
- 0ssifrage
- ducki13
- kiwipi
- lade
- isnowfy
- onesandzeros
- pquentin
- wvanlint
- Álvaro Justen <https://github.com/turicas>
- bjut-hz
- Sergio Oller
- Izam Mohammed <https://github.com/izam-mohammed>
- Will Monroe
- Elijah Rippeth
- Emil Manukyan
- Casper Lehmann-Strøm
- Andrew Giel
- Tanin Na Nakorn
- Linghao Zhang
- Colin Carroll
- Heguang Miao
- Hannah Aizenman (story645)
- George Berry
- Adam Nelson
- J Richard Snape
- Alex Constantin <alex@keyworder.ch>
- Tsolak Ghukasyan
- Prasasto Adi
- Safwan Kamarrudin
- Arthur Tilley
- Vilhjalmur Thorsteinsson
- Jaehoon Hwang <https://github.com/jaehoonhwang>
- Chintan Shah <https://github.com/chintanshah24>
- sbagan
- Zicheng Xu
- Albert Au Yeung <https://github.com/albertauyeung>
- Shenjian Zhao
- Deng Wang <https://github.com/lmatt-bit>
- Ali Abdullah
- Stoytcho Stoytchev
- Lakhdar Benzahia
- Kheireddine Abainia <https://github.com/xprogramer>
- Yibin Lin <https://github.com/yibinlin>
- Artiem Krinitsyn
- Björn Mattsson
- Oleg Chislov
- Pavan Gururaj Joshi <https://github.com/PavanGJ>
- Ethan Hill <https://github.com/hill1303>
- Vivek Lakshmanan
- Somnath Rakshit <https://github.com/somnathrakshit>
- Anlan Du
- Pulkit Maloo <https://github.com/pulkitmaloo>
- Brandon M. Burroughs <https://github.com/brandonmburroughs>
- John Stewart <https://github.com/free-variation>
- Iaroslav Tymchenko <https://github.com/myproblemchild>
- Aleš Tamchyna
- Tim Gianitsos <https://github.com/timgianitsos>
- Philippe Partarrieu <https://github.com/ppartarr>
- Andrew Owen Martin
- Adrian Ellis <https://github.com/adrianjellis>
- Nat Quayle Nelson <https://github.com/nqnstudios>
- Yanpeng Zhao <https://github.com/zhaoyanpeng>
- Matan Rak <https://github.com/matanrak>
- Nick Ulle <https://github.com/nick-ulle>
- Uday Krishna <https://github.com/udaykrishna>
- Osman Zubair <https://github.com/okz12>
- Viresh Gupta <https://github.com/virresh>
- Ondřej Cífka <https://github.com/cifkao>
- Iris X. Zhou <https://github.com/irisxzhou>
- Devashish Lal <https://github.com/BLaZeKiLL>
- Gerhard Kremer <https://github.com/GerhardKa>
- Nicolas Darr <https://github.com/ndarr>
- Hervé Nicol <https://github.com/hervenicol>
- Alexandre H. T. Dias <https://github.com/alexandredias3d>
- Daksh Shah <https://github.com/Daksh>
- Jacob Weightman <https://github.com/jacobdweightman>
- Bonifacio de Oliveira <https://github.com/Bonifacio2>
- Armins Bagrats Stepanjans <https://github.com/ab-10>
- Vassilis Palassopoulos <https://github.com/palasso>
- Ram Rachum <https://github.com/cool-RR>
- Or Sharir <https://github.com/orsharir>
- Denali Molitor <https://github.com/dmmolitor>
- Jacob Moorman <https://github.com/jdmoorman>
- Cory Nezin <https://github.com/corynezin>
- Matt Chaput
- Danny Sepler <https://github.com/dannysepler>
- Akshita Bhagia <https://github.com/AkshitaB>
- Pratap Yadav <https://github.com/prtpydv>
- Hiroki Teranishi <https://github.com/chantera>
- Ruben Cartuyvels <https://github.com/rubencart>
- Dalton Pearson <https://github.com/daltonpearson>
- Robby Horvath <https://github.com/robbyhorvath>
- Gavish Poddar <https://github.com/gavishpoddar>
- Saibo Geng <https://github.com/Saibo-creator>
- Ahmet Yildirim <https://github.com/RnDevelover>
- Yuta Nakamura <https://github.com/yutanakamura-tky>
- Adam Hawley <https://github.com/adamjhawley>
- Panagiotis Simakis <https://github.com/sp1thas>
- Richard Wang <https://github.com/richarddwang>
- Alexandre Perez-Lebel <https://github.com/aperezlebel>
- Fernando Carranza <https://github.com/fernandocar86>
- Martin Kondratzky <https://github.com/martinkondra>
- Heungson Lee <https://github.com/heungson>
- M.K. Pawelkiewicz <https://github.com/hamiltonianflow>
- Steven Thomas Smith <https://github.com/essandess>
- Jan Lennartz <https://github.com/Madnex>
- Tim Sockel <https://github.com/TiMauzi>
- Ikram Ul Haq <https://github.com/ulhaqi12>
- Akihiro Yamazaki <https://github.com/zakkie>
- Ron Urbach <https://github.com/sharpblade4>
- Vivek Kalyan <https://github.com/vivekkalyan>
- Tom Strange https://github.com/strangetom
- Vincent Peth <https://github.com/ShadokDuBas>
- Samer Masterson <https://github.com/samertm>
- William LaCroix <https://github.com/WilliamPLaCroix>
- Peter de Blanc <https://github.com/pdeblanc>
- Jose Cols <https://github.com/josecols>
- Christopher Smith <https://github.com/smithct2>
- Ryan Mannion <https://github.com/ryanamannion>
## Others whose work we've taken and included in NLTK, but who didn't directly contribute it:
### Contributors to the Porter Stemmer
- Martin Porter
- Vivake Gupta
- Barry Wilkins
- Hiranmay Ghosh
- Chris Emerson
### Authors of snowball arabic stemmer algorithm
- Assem Chelli
- Abdelkrim Aries
- Lakhdar Benzahia

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# Natural Language Toolkit (NLTK)
[![PyPI](https://img.shields.io/pypi/v/nltk.svg)](https://pypi.python.org/pypi/nltk)
![CI](https://github.com/nltk/nltk/actions/workflows/ci.yaml/badge.svg?branch=develop)
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. NLTK requires Python version 3.9, 3.10, 3.11 or 3.12.
For documentation, please visit [nltk.org](https://www.nltk.org/).
## Contributing
Do you want to contribute to NLTK development? Great!
Please read [CONTRIBUTING.md](CONTRIBUTING.md) for more details.
See also [how to contribute to NLTK](https://www.nltk.org/contribute.html).
## Donate
Have you found the toolkit helpful? Please support NLTK development by donating
to the project via PayPal, using the link on the NLTK homepage.
## 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.
## Copyright
Copyright (C) 2001-2025 NLTK Project
For license information, see [LICENSE.txt](LICENSE.txt).
[AUTHORS.md](AUTHORS.md) contains a list of everyone who has contributed to NLTK.
### 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.