mpg321 is a completely Free drop-in replacement for mpg123. It has been designed to work as a drop-in replacement for mpg123, for the use of front ends, shell scripts, etc. It does all mp3 decoding using the high-quality integer-only MAD library.
This SourceForge project page is obsolete. Please visit http://www.musicpd.org/
ReZound aims to be a stable, open source, and graphical audio file editor primarily for but not limited to the GNU/Linux operating system.
Sweep is an audio editor and live playback tool. It supports PCM (WAV, AIFF etc.), Ogg Vorbis, Speex and MP3, with multichannel editing and LADSPA effects. Inside lives a pesky little virtual stylus called Scrubby who enjoys mixing around in your file
curses-based mp3 and ogg vorbis player for unix-like systems
A program to record and sequentially play audio spots in e.g. supermarkets. This project is now on github: http://github.com/pryds/spotmachine
tetravex oggserv is a centralised ogg vorbis daemon that by standard comes with a web based interface, but more clients will soon be availible. It functions in the same way as a jukebox. Users can queue up tracks using a client.