1. CrudCRUD is Really Urgly coDed -- 万能快速原型系统
2. Freeproblemsetfreeproblemset is a standard for acm-icpc contest problem storage in xml
3. vjudgeJust a preservation snap of the latest opensource version of virtual-judge
4. hustojPopular Open Source Online Judge based on PHP/C++/MySQL/Linux for ACM/ICPC and NOIP training, with easy installation. 开源OJ系统