Yahoo! Games - Literati
Free Java-based server for Literati and other games.

Word Village
Free online scrabble-like word games. Play the games listed or create and share your own designs using an easy-to-use game designer.

Wabble Online Scrabble
Free online multi-player Ajax-powered Scrabble game clone. Supports automatic dictionary checking (English and German), public and private games, and more features.