The Wub Machine - Turn any music into Dubstep, Drum & Bass, and more.
Youtube-DJ - Mix YouTube songs together
The Eternal Jukebox - For when your favorite song just isn't long enough
Edjing - Discover edjing and edjing Pro, the most powerful DJ apps for music lovers! Mix on Android, Windows and iOS devices and record then share your DJ sets!
Madeon's Adventure Machine - Online remixing tool
YOU.DJ - Mix SoundCloud music and Youtube videos live in your browser.