Incredibox comes from France, and is a fun Flash toy that lets you create a beat-box “band” or “a capella group.” It’s easy to use, and although the site is in French, there is an English version too. Add your own beat, rhythm section, effects, melodies and voices, and then sit back and let ’em sing to you.
Beatlab – draw on the grid with your mouse to make a beat. Add more sounds, vocals, instruments etc. Save your track and share it with friends. App available too.
Both are PC and Mac compatible.