BMForum is a open source forum based on PHP & MySQL. BMForum is a powerful forum with AJAX,Tags,RSS and more Web 2.0 Technology.
Celiz is a open source Judge System. Judge System is a software for doing judge work in Olympiad Informatics match, and also being used in ACM-ICPC International Collegiate Programming Contest.
A Simple But Great Opensource OI Judger More Language Will Be Supported!