LinuxLinks published an overview of 12 free issue tracking systems.

12 Best Free Linux Issue Tracking Systems

Issue tracking systems cover a few different types of computer software applications which help to manage and maintain lists of issues in a number of ways. One of the most common types of an issue tracker is the bug tracking system. This system tracks issues by helping software developers keep on top of reported software bugs and acts as an aid in quality assurance. The other main types of issue tracking systems are service desk and help desk management software which help firms create, update, and resolve reported customer issues.

12 Best Free Linux Issue Tracking Systems