VLC media player is a multimedia player, framework, streamer, and encoder. It can play inputs like files, network streams, DVDs, audio CDs, Blu-Rays, capture devices, and screens. It can play most audio and video codecs and formats (MPEG 1/2/4, H264, VC-1, DivX, WMV, Vorbis, AC3, AAC, MKV, etc.), but can also be used to convert to different formats and/or send streams through the network.
Unix Amiga Delitracker Emulator (UADE) plays most Amiga music file formats by simulating Amiga hardware and software. It plays approximately 200 Amiga music file formats. It provides a command line tool for playing, but it also provides music player plugins for XMMS and Audacious. For other music players, there is a FUSE filesystem that transparently converts Amiga songs to WAV files.
XBMC Media Center (formerly Xbox Media Center) is a multimedia player/jukebox application for Linux, Mac OS X, Windows, and Xbox. It can be used to play or view most common video, audio, and picture formats such as MPEG-1/2/4, DivX, XviD, MP3, AAC, JPG, and GIF directly from a CD or DVD in the Xbox DVD-ROM drive or from the Xbox hard drive. XBMC can also stream files over a local network or from the Internet. Playlist and slideshow functions, a weather forecast, and many audio visualizations are also included.
SoundTracker is a pattern-oriented music editor (similar to the DOS program 'FastTracker'). Samples are lined up on tracks and patterns which are then arranged to a song. Supported module formats are XM and MOD; the player code is the one from OpenCP. A basic sample recorder and editor is also included.
GLAME (GNU/Linux Audio Mechanics) is meant to be the GIMP of audio processing. It is designed to be a powerful, fast, stable, and easily extensible sound editor for Linux and compatible systems. It has full support for non-destructive editing including undo/redo and applying LADSPA effects. Its supported platforms are Linux, BSD, IRIX, and OS X. It uses guile and libxml, and the GNOME libs available is highly recommended. MP3 and Ogg files can be processed if libmad and libvorbisfile are installed.