PHPCast is a little script that streams mp3 files directly from the webserver. It reads mp3 files randomly from a data directory and interprets rather correctly ID3 tags. Platforms: Windows, Mac, Linux

This is a simple, command line based program aimed at converting Winamp style playlists into Nero Audio Compilation (.nra) files to facilitate the burning of favored playlists. Current support is for .m3u and .bpl playlists. Platforms: Windows, Mac, Linux

MP3 portAll is a web-based php-written engine, which allows you join various mp3 resources (ftp and http servers, local or network filesystems) into single music collection and hide its original placement.Fully integrated with WinAmp. Platforms: Windows, Mac, Linux

And ill named php backend for the MixWidget mp3 player available at: http://mixwidget.org/ Platforms: Windows, Mac, Linux

Media Player that let's you play video and music files and also to play videos from the cloud Platforms: Mac

just-a-JukeBox is a one-file JukeBox-Script written entirely in PHP. It uses local mpg123 and so simpleJukeBox is nothing more than a web-based remote-control for your 'MP3-Server' :-) Platforms: BSD, Mac, Linux

JReceiver is a servlet-based audio server which features tightlyintegrated metadata indexing capabilities, browser-based management,an XML-RPC interface and support for network-based MP3 players like theRio Receiver from Sonic Blue. Platforms: Windows, Mac, Linux

This is a little name change. The project will now be devoted to writing a full featured media player in Java. It supports image viewing (slideshows, and most image types) and MP3 playing currently. Platforms: Windows, Mac, Linux

jLibPod is a Java Library for manipulating the database files and related content on an Apple iPod. Platforms: Windows, Mac, Linux

This is a set of classes able to read ID3 V1 and V2 Tags from MP3 files as well as writing them Platforms: Windows, Mac, Linux

H-Mpeg ist ein stand-alone MP3-Player zum 'selber basteln'. Dieses Projekt beschäftigt sich mit der Entwicklung neuer Hardware-Layouts und vor allem neuer Software. Alles natALrlich kostenlos und für die Allgemeinheit :) www.h-mpeg.de Platforms: Windows, Mac, Linux

A cool visual effects program that runs on almost every multimedia players. Platforms: Windows, BSD, Mac, Linux

FAUST (Functional Audio Stream) is a functional programming language specifically designed for real-time signal processing and synthesis. FAUST targets high-performance signal processing applications and audio plug-ins for a variety of platforms and standards. The Faust compiler translates DSP... Platforms: BSD, Windows, Mac, Linux

A cross-platform, MP3 and playlist manager for portable MP3 devices such as the Samsung Napster YP-910GS. Platforms: Windows, Mac, Linux

digui is a pitch-controlled, digital additive synthesizer. No MIDI needed! Just plug in your guitar, toy keyboard, microphone, etc. and play away. Platforms: Windows, Mac, Linux

An application allowing to stream and/or download music legally from the popular libre music site Dogmazic.net. Requires Mono (Unix/Linux/Mac OS) or DotNet (Windows). Platforms: Windows, Mac, Linux

Fast, web based perl mp3 player. Got a computer that can run a web server and perl ? Got it hooked to a stereo ? Want to control a remote mp3 player over a LAN ? You want WebPlayer. Platforms: Windows, Mac, Linux

A utility designed for the use of interfacing with Rio's third through fifth generations of portable mp3 players; Rio 600/800/900/S-Series/Riot/psa[play/Fuse/Chiba/Cali/Nitrus. Platforms: BSD, Mac, Linux

Spectral Orchestrator--A software tool for musicians and composers that creates harmonies/orchestrations from digitally recorded sound files. Currently compiles and runs in Linux and Mac OS X (and eventually Windows/Cygwin). Platforms: BSD, Windows, Mac, Linux

Radman is a package of Bash scripts designed to automate mp3 broadcasting on Linux. Features are: console/web interfaces, daily (or at some time) playlist/song changing, song search etc. Scripts use Shoutcast broadcast server sc_serv and player sc_trans. Platforms: BSD, Mac, Linux