Batuhan Bozkurt makes things involving computational (sound) art. One of his many projects is Otomata, a simple webapp that makes pretty sequenced music. If you try it out, you might get something like this: (Source: Retecool) Like this? Buy me a drink!
Slowing down songs by 800% makes them sound like ambient.
Roc is a browser-based loop composer with real sounding instruments, but sadly, nothing shocking or special.
Tristan Jehan created an interesting bit of python code during Music Hack Day. It turns any song into a swing version.
Audiotool is a simulation where you can use realistic gear to make music from your webbrowser.
iNudge is a simple web-based sequencing toy to make music.
Aviary Myna is a nifty audio editor/composer in your browser. Ideal for beginners.
