Audacity: A Free, Cross-Platform Digital Audio Editor.
(1)Audacity is based on code from the following projects::
expat
FLAC
LAME
libmad
libsndfile
Nyquist
Ogg Vorbis
PortAudio
Resample
SoundTouch
wxWidgets
(2)Audacity is built upon other free libraries; some of these libraries may have come with Audacity in the lib-src directory. Others you are expected to install first if you want Audacity to have certain capabilities. Most
of these libraries are not distributed under the terms of the GPL, but rather some other free, GPL-compatible license. Specifically:
wxWidgets: LGPL
Cross-platform GUI library - must be downloaded and
compiled separately.
expat: BSD-like license.
Provides XML parsing. Included with Audacity
iAVC: LGPL
Part of the code to the AVC Compressor effect.
Included with Audacity.
libid3tag: GPL
Reads/writes ID3 tags in MP3 files. Optional
separate download as part of libmad.
libmad: GPL
Decodes MP3 files. Optional separate download.
libnyquist: BSD-like license.
Functional language for manipulating audio; available
within Audacity for effects processing.
libogg: BSD-like license.
Optional separate download, along with libvorbis.
libflac: BSD-like license.
Optional separate download for libsndfile
libresample: LGPL
High-quality audio resampling.
libsndfile: LGPL
Reads and writes uncompressed PCM audio files.
Included with Audacity.
libvorbis: BSD-like license.
Decodes and encodes Ogg Vorbis files. Optional
separate download.
SoundTouch: LGPL
Changes tempo without changing pitch and vice versa.
Included in audacity