The following people contributed source code to Praat:

 Paul Boersma: user interface, graphics, printing, sound, spectral analysis, pitch analysis, formant analysis, intensity analysis, annotation, speech manipulation, voice report, listening experiments, articulatory synthesis, optimality-theoretic learning, tables, formulas, scripting, and adaptation of PortAudio, GLPK, regular expressions, and Opus.

 David Weenink: feedforward neural networks, principal component analysis, multidimensional scaling, discriminant analysis, LPC, VowelEditor, and adaptation of GSL, LAPACK, fftpack, regular expressions, Espeak, Ogg Vorbis, and Opus.

 Stefan de Konink and Franz Brauße: major help in port to GTK.

 Tom Naughton: major help in port to Cocoa.

 Erez Volk: adaptation of FLAC and MAD.

 Ola Söder: kNN classifiers, k-means clustering.

 Rafael Laboissière: adaptation of XIPA, audio bug fixes for Linux.

 Darryl Purnell created the first version of audio for Praat for Linux.

We included the following freely available software libraries in Praat (sometimes with adaptations):

 XIPA: IPA font for Unix by Fukui Rei (GPL).

 GSL: GNU Scientific Library by Gerard Jungman and Brian Gough (GPL 3 or later).

 GLPK: GNU Linear Programming Kit by Andrew Makhorin (GPL 3 or later); contains AMD software by the same author (LGPL 2.1 or later).

 PortAudio: Portable Audio Library by Ross Bencina, Phil Burk, Bjorn Roche, Dominic Mazzoni, Darren Gibbs, version 19.7.0 of April 2021 (CC-BY-like license).

 Espeak: text-to-speech synthesizer by Jonathan Duddington and Reece Dunn (GPL 3 or later).

 MAD: MPEG Audio Decoder by Underbit Technologies (GPL 2 or later).

 FLAC: Free Lossless Audio Codec by Josh Coalson and Xiph.Org, version 1.3.3 (FLAC BSD 3-clause license).

 Ogg Vorbis: audio compression by Christopher Montgomery (Ogg Vorbis BSD 3-clause license).

 Opus: audio compression by Jean-Marc Valin, Gregory Maxwell, Christopher Montgomery, Timothy Terriberry, Koen Vos, Andrew Allen and others (Opus BSD 3-clause license).

 SILK: audio compression by Skype Limited (Skype Limited BSD 3-clause license).

 fftpack: public-domain Fourier transforms by Paul Swarztrauber, translated to C by Christopher Montgomery.

 LAPACK: public-domain numeric algorithms by Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd., Courant Institute, Argonne National Lab, and Rice University, C edition by Peng Du, Keith Seymour and Julie Langdou, version 3.2.1 of June 2009.

 Regular expressions by Henry Spencer, Mark Edel, Christopher Conrad, Eddy De Greef (GPL 2 or later).

 Unicode Character Database by Unicode Inc., version 14.0 of September 2021 (Unicode Inc. license agreement)

Most of the source code of Praat is distributed under the General Public License, version 2 or later. However, as Praat includes the above software written by others, the whole of Praat is distributed under the General Public License, version 3 or later.

For their financial support during the development of Praat:

 Netherlands Organization for Scientific Research (NWO) (1996–1999).

 Nederlandse Taalunie (2006–2008).

 Talkbank project, Carnegie Mellon / Linguistic Data Consortium (2002–2003).

 Stichting Spraaktechnologie (2014–2016).

 Spoken Dutch Corpus (CGN) (1999–2001).

 Laboratorium Experimentele OtoRhinoLaryngologie, KU Leuven.

 DFG-Projekt Dialektintonation, Universität Freiburg.

 Department of Linguistics and Phonetics, Lund University.

 Centre for Cognitive Neuroscience, University of Turku.

 Linguistics Department, University of Joensuu.

 Laboratoire de Sciences Cognitives et Psycholinguistique, Paris.

 Department of Linguistics, Northwestern University.

 Department of Finnish and General Linguistics, University of Tampere.

 Institute for Language and Speech Processing, Paradissos Amaroussiou.

 Jörg Jescheniak, Universität Leipzig.

 The Linguistics Teaching Laboratory, Ohio State University.

 Linguistics & Cognitive Science, Dartmouth College, Hanover NH.

 Cornell Phonetics Lab, Ithaca NY.

Finally we thank:

 Ton Wempe and Dirk Jan Vet, for technical support and advice.

 Daniel Hirst and Daniel McCloy, for managing the Praat Users List.

 Rafael Laboissière and Andreas Tille, for maintaining the Debian package.

 Jason Bacon and Adriaan de Groot, for maintaining the FreeBSD port.

 José Joaquín Atria and Ingmar Steiner, for setting up the source-code repository on GitHub.

 Hundreds of Praat users, for sending suggestions and notifying us of problems and thus helping us to improve Praat.

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