Free Software Issue Tracker Tools?

Foreword: my experience with RT stopped with version 3.8

It's a really good software: it excels at issue tracking but it's not directly suitable for workflow management (person X must do this part of the job first, then it goes to person Y that has to do another part, etc.)
Support for this could be added but it requires quite a bit of Perl expertise :slight_smile:

If you need this kind of behavior I believe you want something different, but to this end I don't know how good the other listed tools are.