http://www.thirtykingdoms.com/game.php
Thirty kingdoms is a fun game based strategy game, with no real class combinations. it would require almost no features to implement, since it is so small and self contained, simply the ability to list you play it on this site for your guild (alliance)
In every game (like a round of risk or chess say) you control a country, and the goal is to grow your kingdom economically or in war. strategy and alliances are critical.