Q3mass is a master server program for Quake III Arena engine-based games. It's easily extensible and supports multiple games. Q3mass-php, an offshoot project, is a PHP version of the application, allowing for web-based master servers.
It can be used to guess the result of WorldCup matches in a kind of Virtual Casino. The players compete in guessing the correct result of some kind of match. Soccer, Baseball, Basketball, or even Yes/No questions like: will Brazil win the next WorldCup ?