MilkDrop - 3D audio visualization plugin, compatible with WinAmp plugin API
PastBook - PastBook is an online service that allows you to create your own beautiful photobooks and share them with friends and family.
projectM - projectM is an LGPL'ed reimplementation of Milkdrop under OpenGL.
Kemento - Your life stories captured, forever
Magic Music Visuals - Fully-customizable and highly responsive visuals for live and recorded audio & MIDI.
Timehop - Your digital life history