Foobar2000 is an advanced audio player for the Windows platform. Some of the basic features include ReplayGain support, low memory footprint and native support for several popular audio formats.

Features
* Open component architecture allowing third-party developers to extend functionality of the player
* Audio formats supported "out-of-the-box": WAV, AIFF, VOC, AU, SND, Ogg Vorbis, MPC, MP2, MP3
* Audio formats supported through official addons: MPEG-4 AAC, FLAC, OggFLAC, Monkey's Audio, WavPack, Speex, CDDA, TFMX, SPC, various MOD types; extraction on-the-fly from RAR, 7-ZIP & ZIP archives
* ReplayGain support
* Low memory footprint, efficient handling of really large playlists
* Advanced file info processing capabilities (generic file info box and masstagger)
* Highly customizable playlist display
* Customizable keyboard shortcuts
* Most of standard components are opensourced under BSD license (source included with the SDK)

thanks to kennyljs for the submission... Read more for downloads. foobar2000 v0.7.2 changelog:
- fixed minor resource leak when restarting playback
- added process priority slider in preferences
- more replaygain scanner improvements - more natively supported samplerates, option to skip files already having rg info is back, custom album grouping, etc
- fixed replaygain scanner bugs with 5.1 source
- fixed rare crash in faded dsound
- corrected minor problem with clicking system tray icon with certain settings
- fixed bug in EQ code
- added new multiselection file info box

Download : foobar2000 download page
Source : foobar2000 homepage