Drawasaurus - Drawasaurus is an online drawing & guessing game you can play with friends or strangers.
LetsDraw.It - Guess and Draw, Drawing Battle, Pictionary, Copy picture - online drawing games where you can compare your skill with others.
Draw Something - The most popular social drawing and guessing game in the App Store with over 7 billion drawings created!
iSketch - Isketch is a Free to play, Puzzle, Education, Word, Drawing and Multiplayer video game.
Drawception - The browser-based party game that combines the telephone game with drawing! Hilarity ensues.
SketchParty TV - SketchParty TV is a high-tech drawing game that plays a bit like Pictionary.