Open Source Helpdesk

Open source helpdesk software have been popping around in the last years. If you want a features-rich and mature helpdesk solution, look first at RT or OTRS. Many other open source helpdesk solutions exist for smaller or defect tracking oriented needs.

Leading Open Source Helpdesk software

Other Open Source Helpdesk software

Mantis is a very easy to use bug tracker system. With a very neat interface, Mantis is very usable, and can be installed in a minute on a classical (L)AMP stack.

eTicket is a PHP-based electronic support ticket system that can receive tickets via email (pop3/pipe) or a web form. It also offers a ticket manager with many features.

osTicket is a widely-used open source support ticket system. It seamlessly integrates inquiries created via email and web-based forms into a simple easy to use multi-user web interface. Easily manage, organize and archive all your support requests and responses in one place while providing your clients with accountability and responsiveness they deserve.
osTicket is an attractive alternative to higher-cost and complex customer support systems; simple, lightweight, reliable, open source, and easy to setup and use. The best part is, it's completely free.

Sinergia is a web based framework for developing help desk management solutions in .NET 3.0

Zentrack is a fully customizable help desk, bug tracking, and project management system. It is designed for systems with less than 10,000 users