Word Domination - Word Domination is a fast paced and addictive real-time word game.
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!
Wordfeud - A fun multiplayer word game. Who can make the highest scoring words?
Crosswords Arena - Word game, multiplayer and computer players
Wordiamo - Wordiamo is a word game.
Lexica - An open source word-search game.