Zinf

Zinf is an extensible, cross-platform audio player formerly known as Free Amp. As per the zinf web site "Zinf is based on the FreeAmp source code. However, AMP is a trademark of PlayMedia Systems, Inc., and therefore the original name of the project cannot be used any longer. On this website the old project will be referred to as FreeA*p."

Zinf features an optimized version of the GPLed Xing MPEG decoder, a powerful music browser and playlist editor, and a built in download manager which supports downloading files from sites using the RMP (RealJukebox) download process, and a number of the most common features users have come to expect in a clean, easy to use interface, including:

Plays all MPEG 1, MPEG 2, and MPEG 2.5 encoded files
Support for Xing's Variable Bitrate Encoding Technology.
Ability to play songs over the Internet through either HTTP unicast streaming (ShoutCast), or RTP multicast streaming (Obsequiem).
Supports IceCast style title streaming.
Can save ShoutCast and IceCast streams locally to your computer for offline listening.
User defined prebuffering for slower machines.

The GNU/Linux version has these additional features: