- https://github.com/mantisbt/mantisbt (Mantis Bug Tracker)
- https://github.com/dubeaud/bugnet (An open source issue tracker built with .NET)
- https://github.com/aspnet/BugTracker (Sample BugTracker application that uses MVC for APIs and SignalR for real-time)
- https://github.com/bugzilla/bugzilla (Official repository for the Bugzilla bug tracking system)
- https://github.com/Flyspray/flyspray (Flyspray Bug Tracking System)
- https://github.com/dradis/dradis-ce (Colllaboration and reporting for IT Security teams)
- https://github.com/OWASP/django-DefectDojo (Open-source defect tracking application)