winLAME is an encoder for several audio formats, including mp3 (MPEG Layer 3), Ogg Vorbis and more. winLAME lets you set up the encoding process with an easy-to-use wizard-style user interface.

winLAME supports many input audio formats, and uses the LAME mp3 encoding library for encoding and the MAD decoding library for decoding.

MoreAmp, audio player, transcoder and cd ripper for Mac OS X, OS 9, Windows, Unix, and Linux. Plays and creates ogg, flac, mp3, aac, m4a, mp4, wav, and aif, and plays wma. 31-band equalizer, repeat loop, variable pitch/tempo, ram or ramdisk preload, more.

MLDonkey Watch is a Windows/Linux GUI for MLDonkey it is written in Delphi and compatible with Kylix.

IDFree is a simple MP3 ID3 tag editor for Windows. It uses the excellent Open Source id3lib library to read and write these ID3 tags.

OggCarton is a free, open source, home jukebox system that rips, indexes, and manages playlists for Ogg Vorbis music files. Includes a web server for playing files on your home network. Compatible with existing MP3 files.

Dcon Pro is a file sharing client and server based on the DirectConnect protocol (neo-modus.com) for the Windows platform. Client supports simultaneous hub connections, a refined MP3 search, and ability to download the same file from multiple users at the same time.

Hydrogen is an advanced drum machine for GNU/Linux. It's main goal is to bring professional yet simple and intuitive pattern-based drum programming.

restoreInpaint is a state of the art project about making 8 or 16bit depth images "better".

Csound is a sound and music synthesis system, providing facilities for composition and performance over a wide range of platforms. It is not restricted to any style of music, having been used for many years in the creation of classical, pop, techno, ambient, experimental, and (of course) computer music, as well as music for film and television.

PortAudio is a cross platform, open-source, audio I/O library.It provides a very simple API for recording and/or playing sound using a simple callback function.