Open-source help desk software has been popping around in the last few years. If you want feature-rich and mature open-source help desk software, look first at RT or OTRS. Much other help desk software exists for smaller or defect-tracking-oriented needs. Just try to identify the open-source help desk software you need by carefully reviewing the features. Usually, the installation process of this kind of software is pretty straightforward, give them a try.
Leading Open Source Help desk software
RT is an enterprise-grade ticketing /helpdesk software that enables a group of people to intelligently and efficiently manage tasks, issues, and requests submitted by a community of users. It is widely used as a helpdesk system. RT manages key tasks such as the identification, prioritization, assignment, resolution, and notification required by enterprise-critical applications including project management, help desk, NOC ticketing, CRM, and software development. RT is used by Fortune 100 companies, government agencies, educational institutions, and development organizations worldwide.
Other Open Source Helpdesk software
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 the accountability and responsiveness they deserve.
Double Choco Latte is a GNU Enterprise package that provides basic project management capabilities, time tracking on tasks, call tracking, email notifications, online documents, statistical reports, a report engine, and more features that are either working or being developed/planned. It can be displayed inside a phpGroupWare installation or be used stand-alone. It is licensed under the GPL (GNU Public License.
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.
Eventum is a user-friendly and flexible issue-tracking system that can be used by a support department to track incoming technical support requests, or by a software development team to quickly organize tasks and bugs.
The source code is available through the GPL license.
A tailored web-based ICT helpdesk system, with in-built knowledge base capabilities, CMDB functionality, and statistical reporting. Fully configurable through the web interface.
OneOrZero Helpdesk and Task Management System is a powerful enterprise helpdesk system used by companies and groups large and small to manage information and requests in their organization.