mpg123!

Quod Libet is a Gapless GTK+-based audio player written in Python. Its designed around the idea that you know how to organize your music better than we do. It lets you make playlists based on regular expressions (dont worry, regular searches work too). It lets you display and edit any tags you want in the file. And it lets you do this for all the file formats it supports - Ogg Vorbis, FLAC, MP3, Musepack, and MOD.

Qmmp is an audio-player, written with help of Qt library. The user interface is similar to Winamp or xmms.

MOC (music on console) is a console audio player for LINUX/UNIX designed to be powerful and easy to use.

Mp3blaster is an mp3 player for computers running a UNIX-like operating system, e.g. Linux, Free/Net/OpenBSD, etc. Its interface is entirely text based, thereby eliminating the need for a graphical environment like X-Windows. This does not limit the way you can control the player whilst playing though; just like any graphical mp3 player, there are cd-style buttons like play, stop, pause, next track, etc.

Potamus is a lightweight GTK-based audio player with a simple interface and an emphasis on high audio quality.

mpg321 is a very popular command-line mp3 player. mpg321 is used for frontends, as an mp3 player and as an mp3 to wave file decoder (primarily for use with CD-recording software.).

vitunes is a curses-based music player and playlist manager for *nix whose goals are: 1. a minimalistic appearance, 2. strong vi-like bindings, and 3. quick playlist creation/management. vitunes does not strive to be a feature-rich media player, but rather a quick, vi-like media indexer and playlist manager, that just happens to be able to play the music it indexes.