tulpasynth
"tulpasynth" is a real-time collaborative music creation system.
It is a collaborative web-based application for creating music with others by manipulating simple shapes in the web browser.
I would love to enhance this application in the future by making the sound and interactions much more interesting and applicable to a touchscreen interface.
You can read more about it, and see a short video of it in action on the tulpasynth page.
https://ccrma.stanford.edu/~colinsul/projects/tulpasynth_v01/