The Wub Machine - Turn any music into Dubstep, Drum & Bass, and more.
Until AM - DJ in your browser with this SoundCloud music mixer
YOU.DJ - Mix SoundCloud music and Youtube videos live in your browser.
Songlio - Free musical guessing game: race friends to name that tune
The Eternal Jukebox - For when your favorite song just isn't long enough
Fretello Stage - Jam, record and share your music in the blink of an eye