Audio Daemon is a perl module to daemonize various players and support a single UDP interace for different players.
mServe is a networked MP3 player.
MAES (an MP3 Audio Entertainment System) is a set of Perl scripts which allow searching and streaming of MP3s over the net.
mixplayd is a daemon that can be told to play mp3 (and now also ogg) files from the local file system.
The Allegro Media Server streams digital music from Macintosh iTunes libraries to wired or wireless networked digital players