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A PHP Web Application that you can install on your own web server. It allows you to play chess with other users across the internet or sitting at the same screen. It only permits valid moves and can automatically detect check and checkmate status.
Diplomacy is a popular turn based strategy game in which you battle to control Europe; to win you must be diplomatic and strategic. webDiplomacy lets you play Diplomacy online. Official game server: http://webdiplomacy.net/
This sofware is designed to help different chess clubs to set up their own rating system. It uses USCF approximation formulas for rating calculations. Working example at newarkcc.vfutbole.ru
BOER (Battle Order - Educational Risk) is a modification of the popular board game with a twist. Instead of using the luck of the draw your ammunition will be your knowledge on the subject of choice. This is a fork of the Netrisk Open source project.
Forum Chess takes the one-on-one mentality of chess and throws it out the window.
Forum Chess interfaces with a BBS and allows a team-based chess game. Up to four players can be involved with a team and can collaborate with eachother in order to win.