Audio editor for recording, slicing, and mixing audio. Site includes help, downloads, and developer information. (C++) [Cross-platform]

Music player and manager with support for cover art, last.fm integration, and QtScript plugins. Site includes forum, downloads, help and support, and developer information. [Cross-platform]

Music player which integrates with online content via plugins. Site contains project news, download, add-ons directory, help, and how to contribute. (C++) [Cross-platform]

A patent-free lossless audio codec with utilities for editing meta-data. Site includes utility downloads, comparison with other codecs, and links to things that use FLAC. [Cross-platform]

An open source audio player for Linux and Win32, supports MP3, Ogg/Vorbis, WAV and Audio CD playback, SHOUTcast/Icecast HTTP streaming, RTP streaming, with a powerful music browser, theme support and a download manager.

Lossy audio codec optimized for speech. Site contains comparison with other codecs, downloads, and a directory of software which uses Speex. [Cross-platform]

Tracker meant to clone the features of Jeskola Buzz. Site includes screenshots, downloads, and development information. [Linux]

Open-source mp3 encoder meant as an educational tool. Site includes development information and project history. [Cross-platform]

A multichannel digital audio workstation. (C++) [GNU/Linux, Mac OS X]

Contains information for musicians wishing to use Ubuntu-Linux as their Digital Audio Workstation.