[divyahansg]

A similar site I built (http://stoodle.org) supports these three features in addition to group voice conferencing through Twilio.

[oscilatorium]

I just tried stoodle, but I'm not seeing the data being replicated across windows. e.g I have some doodles here in http://stoodle.ck12.org/class/53f619cc417e3 but when i open this link in another chrome tab (or a different browser ffox), I am not seeing anything

[atmosx]

Haha, that's awesome :-) thanks for sharing.