VJmachine - Music Visualizer - Make a VJ show like a PRO. Music visualizer for a unique tight symbiosis of sound and video.
projectM - projectM is an LGPL'ed reimplementation of Milkdrop under OpenGL.
MilkDrop - 3D audio visualization plugin, compatible with WinAmp plugin API
Magic Music Visuals - Fully-customizable and highly responsive visuals for live and recorded audio & MIDI.
R4 - R4 is a standalone OpenGL accelerated program (created by Gordon Williams of RabidHaMsTeR.
Avee Player - Avee Music Player for Android