Drawasaurus - Drawasaurus is an online drawing & guessing game you can play with friends or strangers.
Drawesome.uy - Offers both Drawing & Guessing games as well as collaborative drawing lobbies.
LetsDraw.It - Guess and Draw, Drawing Battle, Pictionary, Copy picture - online drawing games where you can compare your skill with others.
Doodle or Die - It's like the game of Telephone. Except with doodles.
Draw Something - The most popular social drawing and guessing game in the App Store with over 7 billion drawings created!
Aggie.io - Draw a picture together with your friends in real-time over the internet in your browser.