Trac

"Trac is an open source, Web-based project management and bug tracking system. It has been adopted by a variety of organizations for use as a bug tracking system for both free and open-source software and proprietary projects and products. Trac integrates with major version control systems including ("out of the box") Subversion and Git.

Trac offers a simple approach to project management by deeply integrating ticket tracking, version control (for which multiple repositories per environment are supported)^, and wiki. It allows hyperlinking information between these systems, include wiki content directly in a ticket or list tickets automatically on wiki pages.

The ticket system can be used for tracking bugs, tasks, issues, incidents or any other kind of ticket. Customized reports can be generated from parametric stored SQL queries or using an interactive ticket query system. There is also an integrated search engine and a fine-grained permission system.

Additional project management features include grouping tickets into milestones and a roadmap where the milestones and their progress are listed and visualized. The recent activity is shown on a timeline page, users are notified by email or can subscribe to RSS or iCalendar feeds."

https://en.wikipedia.org/wiki/Trac

https://trac.edgewall.org/