Just some days ago, Sonic Charge released JS80TRX as a fun project. It is a browser based chiptune tracker with three voices and eight patterns. All for the joys of limitation smile All songs can be shared easily, since the tune itself can be encoded into the URL.
When I heard about it yesterday I immediately created a little tune, inside the Safari browser on my iPhone.
Video and URL here: https://twitter.com/tubesockor/status/9 … 9902362633

it's funny and well design. I generally don't really enjoy web based trackers, but this one is so small and neat it becomes great in itself! Do you know if it's open source?

Yes, the limitations (and great design) is what make it so good I think. It forces you to finish your song smile
I don't think it is Open Source per se, but since it is done in javascript, the source is of course readily available.