There are several free and open-source Helpdesk ticketing systems available that can streamline support operations for any team. OTRS is a flexible tool designed for handling customer requests and internal queries efficiently. MantisBT, while originally a bug tracker, also functions well for managing support tickets with collaboration features. Request Tracker (RT) is a reliable and mature system used by institutions worldwide for tracking issues and requests. osTicket simplifies support by converting emails into organized ticket threads. Bugzilla, developed by Mozilla, is excellent for tracking bugs but also adapts to general support needs. Spiceworks offers a complete IT HelpDesk solution with asset management features, ideal for internal IT teams. Finally, PHD Help Desk provides a straightforward and lightweight platform suitable for smaller organizations needing a basic support system.