An online judge for programming contests.
Unmaintained. Please fork and maintain if you wish. Here are some notes for a future maintainer:
1. The backend is not built for large-scale submissions over the web (it works OK for a small contest). The key missing component is a job queue for submissions. If this is implemented, then the backend will be able to scale.
Work with: MySQL, PostgreSQL, FirebirdSQL. Use PHP, and ExtJS. Browse in Tree: db,table,column,constraint,trigger,view,proc. Has history, and fragments panel. Editor has autocomplete, autoindent. Easy install, unpack in webroot and edit "set.php"