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GNU ccAudio2 is a stand-alone portable C++ class framework for manipulating audio data. GNU ccAudio2 offers platform indipendent classes for directly accessing audio files from disk. These classes are endian aware and also, unlike some audio file manipulation libraries, content format aware; ccAudio treats audio as an array of descreat sample points rather than simply as binary data. ccAudio can also manipulate header information such as annotations. GNU ccAudio2 supports sun audio, raw samples, and RIFF encoded audio data. In addition to manipulating audio thru disk files, GNU ccAudio2 can provide audio processing of sample sets in memory. This includes generation of pure tones, energy measurement of audio poackets, and software codec conversions. GNU ccAudio2 includes a framework for developing plugin audio codecs and is intended to be a carrier for freely licensed audio codecs as well as to expand into a general purpose audio/signal processing C++ library.

The CELT codec is an experimental audio codec for use in low-delay speech and audio communication. It's meant to close the gap between Vorbis and Speex for applications where both high quality audio and low delay are desired.

Ardour is a digital audio workstation. You can use it to record, edit, and mix multi-track audio. Produce your own CD's. Mix video soundtracks. Experiment with new ideas about music and sound. Generate sound installations for 12 speaker gallery shows. Ardour capabilities include: multichannel recording, non-linear, non- destructive region based editing with unlimited undo/redo, full automation support, a mixer whose capabilities rival high end hardware consoles, lots of plugins to warp, shift, and shape your music, and controllable from hardware control surfaces at the same time as it syncs to timecode. If you have been looking for a tool similar to ProTools, Nuendo, Cubase SX, Digital Performer, Samplitude, or Sequoia, you might have found it.

Audiere is a high-level audio API. It can play Ogg Vorbis, MP3, FLAC, uncompressed WAV, AIFF, MOD, S3M, XM, and IT files. For audio output, Audiere supports DirectSound or WinMM in Windows, OSS on Linux and Cygwin, and SGI AL on IRIX. Audiere is open source and licensed under the LGPL. This means that you may freely use Audiere in commercial products, as long as you do not modify the source code. If you do modify Audiere and release a product that uses your modifications, you must release your changes to the code under the LGPL as well. Audiere is portable. It is tested on Windows, Linux-i386, Cygwin, and IRIX with at least three major compilers. Most of Audiere is endian-independent, so I expect it would work with few modifications on other architectures.

Vorbis is a general purpose audio and music encoding format contemporary to MPEG-4's AAC and TwinVQ, the next generation beyond MPEG audio layer 3. Unlike the MPEG sponsored formats (and other proprietary formats such as RealAudio G2 and Windows' flavor of the month), the Vorbis CODEC specification belongs to the public domain. All the technical details are published and documented, and any software entity may make full use of the format without royalty or patent concerns. This package contains: - libvorbis, a BSD-license software implementation of the Vorbis specification by the Xiphophorus company. - libvorbisfile, a BSD-license convenience library built on Vorbis designed to simplify common uses. - libvorbisenc, a BSD-license library that provides a simple, programmatic encoding setup interface.

Musicbox is a simple one-file-at-a-time audio tag editor. It can edit ID3, Vorbis and FLAC tags via the TagLib library.

AcoustID fingerprinter is a cross-platform GUI application that uses Chromaprint to submit audio fingerprints from your music collection to the AcoustID database. Only tagged audio files are submitted. Files tagged by MusicBrainz applications such as Picard or Jaikoz are preferred, but it will submit fingerprints for any files that have tags such as track title, artist name, album name, etc.

Speex is an Open Source/Free Software patent-free audio compression format designed for speech.

libworkman is a library that provides hardware control for various audio apps.

Speex is an Open Source/Free Software patent-free audio compression format designed for speech.