Cerberus Helpdesk is a next-generation, browser-based helpdesk focused on the indexing and sharing of knowledge between team members. The result is quick, relevant answers for customers. A flexible workflow system allows the quick association of knowledge resources and inbound customer e-mail. A highly-sophisticated anti-spam engine adapts to tricks used by spammers to filter abnormal e-mail. The project has an installed base of over 13,000 companies and has been under constant development for nearly 5 years. The source code is provided to encourage collaboration in the highly-active community, as well as flexibility, integration and security.