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

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.

The Pixie Pit Scrabble
Play free e-mail Scrabble. Supports two, three and four player games. Also has chat and a forum.