Game Courier supports many different games. Here is one picked at random:
Star Pool Chess - Large variant of Makruk, with a center non-square that acts as a bridge.

Tank Chess

If you had a Java-capable browser, you could play Tank Chess here.
Keys "s"=save "l"=load "b"=back once

Tanks push units. Bombs and Nukes move as kings but do not capture. If exploded, Bombs destroy everything on the adjacent squares, and Nukes destroy everything up to two squares away.

I thought that if the king is pushed off the board leaving you with no move, it should be a stalemate.

Chess Variants