GDAM (www.ffem.org/gdam) is an MP3 player that can also be used for mixing music. Any number of MP3 files can be mixed in a turntable-style interface. GDAM is not supported by as many platforms, but is known to work on Debian, RedHat and FreeBSD.
TK3play (www.msc.cornell.edu/~bef2/) is another player for Linux that is worth a look. It is still in development, though, the latest release being dated June 1998. The program has a Tk graphical interface and requires TclX 8.0 or 7.6 to run. Although it does not have many of the options of the other players, the graphical layout is clear and easy to use.
JukeBox (http://daemon.ratisbona.com/) is a different type of MP3 player and is based on mySQL, Apache and Perl. It plays files stored on a computer's hard disk through a Web interface which can also handle file uploading. The programmer claims that it was developed for an Internet cafe to let the customers choose their own music. Streaming is possible with Jukebox.