MantisBT
Helpdesk & TicketingOpen-source bug tracker for software teams
Replaces Jira, Bugzilla
Bugzilla is a popular proprietary tool in the helpdesk & ticketing space. These open-source apps let you replace Bugzilla with software you host and control yourself.
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Moving off Bugzilla means trading a managed subscription for a service you run yourself. The payoff is ownership: no per-seat pricing, no vendor lock-in, and full control of your data. Start with the option above that matches your setup-difficulty comfort level — every app links to a detailed specs page and head-to-head comparisons.