7 Top Open-Source Bug Tracking Systems Every Developer Should Know

Bugzilla

Bugzilla is an open‑source web application for bug tracking and testing, developed by Mozilla under the Mozilla Public License. Used by companies like Mozilla, Red Hat, and GNOME, it was created in 1998 by Terry Weissman, written in Perl with MySQL as the backend, offering rich functionality and highly optimized database features.

Redmine

Redmine is an open‑source, web‑based project management and defect tracking tool. It provides calendars and Gantt charts for visualizing project progress, supports multi‑project management, integrates issue tracking, and works with various version‑control systems.

Trac

Trac is more than a bug tracker; it combines a Wiki and project management features. Developed in Python for software projects, it offers a minimalist web‑based approach while still delivering essential functionality, though mastering its extensive interface may take time.

Mantis

Mantis (MantisBT) is a PHP‑based bug management system known for easy installation, lightweight design, and support for 49 languages, making it a widely used error‑tracking tool. Version 1.2.0 introduced an event‑driven plugin system, reflecting its long‑standing presence in the field.

Fossil

Fossil is a simple, easy‑to‑use bug tracking system that also provides a Wiki and other project‑management features, similar to Trac. Its key components include a distributed version‑control system, web interface, automatic synchronization, HTTP support, embedded CGI, and a reputation for robustness.

Phabricator

Phabricator, an open‑source tool from Facebook, offers powerful code‑review capabilities. Engineers can comment on individual lines or blocks of code, request changes, and only after explicit acceptance can code be merged, enforcing good development practices through automation.

WebIssues

WebIssues is a client/server team collaboration and issue‑tracking tool suitable for small development teams. It is easy to deploy and customize, running on any host that supports PHP and MySQL or PostgreSQL, with clients available for Windows and Linux desktops.