Devana is an open source browser strategy game developed from the ground up (without any third party code) using OOP (Object Oriented Programming) code written in the MVC (Model View Controller) paradigm.
http://devana.eu/
http://www.facebook.com/DevanaGame
The gaming ladder is an open source Elo-based competitive gaming ladder. The code is currently used for The Battle for Wesnoth at http://wesnoth.gamingladder.info. The project is stable and in use by thousands of players.
A working browser-based Space Game that demonstrates advanced concepts such as hexagonal navigation, vector visibility, and a message-based battle engine. Currently seeking a CVS release manager to distribute the code.