Ortograf Shareware to play Scrabble on all Macintosh with OS 6.0.7 or later. Play with others or against the computer, 4 levels of difficulty, 4 types of games, complete dictionary. Aussi en version française.
http://www.ortograf.com
WordWars Offers rules, download, and development for a four player network and single player games with optional random boards and skins.
http://www.wordwars.net/