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Quod Libet is a PyGTK audio player that supports many ways to search your library. It lets you make playlists based on regular expressions, and you can add any tags you want to your audio files.
BMPx is the successor to the XMMS-based Beep Media Player. It features support for specifications like XDS DnD, XSPF and DBus. BMPx is highly interoperable and integrates well with other applications and a variety of desktop environments.
Jajuk is software that organizes and plays music. It is a fully-featured application geared towards advanced users with large or scattered music collections.