MilkDrop - 3D audio visualization plugin, compatible with WinAmp plugin API
QLab - QLab, Live show control for Mac OS X.
Plane9 - Plane9 is a revolutionary 3d visualizer where you never have to settle for just one view ever again.
Cue Player - Cue Player software for theater sound and lighting
Magic Music Visuals - Fully-customizable and highly responsive visuals for live and recorded audio & MIDI.
Trigger Audio and Video Playback - Audio and video cue player for broadcast and live performance.