Foobar 2000

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. Foobar 2000 is developed by Peter Pawlowski, a well known developer of Winamp plugins.

Features include:
# 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 & ZIP archives
# Full Unicode support on Windows NT
# 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)

Download here