Chessweb is a J2EE chess game Website. It is a pure Java servlet implementation of a two-player chess game.
Two players log into the Web site, see an image of the current board in their browser, and make their moves.
The differentiating features of chessweb (e.g. versus WinBoard / XBoard) is that it's an extremely lightweight implementation written completely in Java (nothing more than an app server and browser is required).
Furthermore, the client end is DHTML only, and verified to works with FireFox 1.0.6 and IE 6.