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, and regular expressions.

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

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.

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).

GLPK: GNU Linear Programming Kit by Andrew Makhorin (GPL).

PortAudio: Portable Audio Library by Ross Bencina, Phil Burk, Bjorn Roche, Dominic Mazzoni, Darren Gibbs.

Espeak: text-to-speech synthesizer by Jonathan Duddington (GPL).

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

FLAC: Free Lossless Audio Codec by Josh Coalson.

fftpack: public domain Fourier transforms by Paul Swarztrauber and Monty.

LAPACK: public domain numeric algorithms by Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd., Courant Institute, Argonne National Lab, and Rice University.

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

For technical support and advice:

Ton Wempe, Dirk Jan Vet.

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).

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:

Daniel Hirst, for managing the Praat Discussion list.