Magic Music Visuals - Fully-customizable and highly responsive visuals for live and recorded audio & MIDI.
MilkDrop - 3D audio visualization plugin, compatible with WinAmp plugin API
projectM - projectM is an LGPL'ed reimplementation of Milkdrop under OpenGL.
Avee Player - Avee Music Player for Android
Kauna - Kauna is a music visualizer. Kauna renders any sound reproduction in system.
Morphyre - Animated, 3D Music Visualization with thousands of unique scenes.