Crosswords Arena - Word game, multiplayer and computer players
Drawasaurus - Drawasaurus is an online drawing & guessing game you can play with friends or strangers.
Tanglet - Tanglet is a single player word finding game based on Boggle.
skribbl - Word guessing based on drawing.
Quackle - Open-source word game similar to Scrabble. Features a board editor, analysis tools, and artificial intelligence that rivals the best players in the world!
gartic.io - Draw, guess, and win!