Magic Music Visuals - Fully-customizable and highly responsive visuals for live and recorded audio & MIDI.
YouTube - Our mission is to give everyone a voice and show them the world.
MilkDrop - 3D audio visualization plugin, compatible with WinAmp plugin API
Facebook Gaming - Watch and stream live games on Facebook
projectM - projectM is an LGPL'ed reimplementation of Milkdrop under OpenGL.
YouNow - YouNow is a free social networking app that allows you to connect with other users via live video broadcast.