DrawPile - Drawpile is a drawing program that lets you share the canvas with other users in real time.
Aggie.io - Draw a picture together with your friends in real-time over the internet in your browser.
Drawception - The browser-based party game that combines the telephone game with drawing! Hilarity ensues.
FlockMod - Flockmod is a free real time online group drawing app with all the bells and whistles.
Doodle or Die - It's like the game of Telephone. Except with doodles.
gartic.io - Draw, guess, and win!