DOMjudge is an automated judgement system to run programming contests. It provides a mechanism to submit problem solutions and interfaces for teams, the jury, and the general public. It is lightweight, and depends on standard software to do its task. It has a Web interface for portability and simplicity. It is scalable, so distributed judging is easy. There is a modular system for plugging in languages and compilers. It features rejudging, clarifications, and detailed submission/judging info.