mixplayd is a multi-channel MP3 player daemon controlled over a TCP port. It has all functions like play/pause/stop/seeking plus special mixer functions. The number of channels and sound devices (including named pipe support) can be changed at run time. It is meant to be used in conjunction with a playlist-maintaining client.
ELMP:TNG Server is the server component of the Embedded Linux MP3 Player, a digital audio jukebox with some unique features. It is designed to run on customized PC hardware as part of a HiFi system or car stereo, but could also be used as a backend for a desktop MP3 player. Features include multiple playlists, a VFS layer, and plugins for decoder/output/vfs functions.
wavnorm is a simple command line utility to destructively maximize or alter the colume of a stereo .wav file. It's handy for making the volumes of a range of .wav files consistent before or after mp3 conversion, audio CD burning, etc. nplay is a simple .wav player with VU meter and peak meter. nrecord is a simple .wav recorder with VU meter and peak meter. Although simple the VU meter greatly aids getting optimum recording quality. nplay and nrecord use the newt text mode library.