projectM - projectM is an LGPL'ed reimplementation of Milkdrop under OpenGL.
VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
MilkDrop - 3D audio visualization plugin, compatible with WinAmp plugin API
AIMP - AIMP : Free Audio Player : Официальный сайт программы
Magic Music Visuals - Fully-customizable and highly responsive visuals for live and recorded audio & MIDI.
foobar2000 - An advanced freeware audio player for the Windows platform.