I have used Jira for about 3 years. I have also helped developing a few bug/issue trackers. I must say when we used Jira for a project, its the bug/issue tracker to beat.
I think Jira is a good candidate if we are open to using a close source product. The guy who decided to use Jira for the project simply told me, lets just pay them since we are not out to make the best bug tracker and we will be busy doing our real project. And I can say after 3 years, he was correct.
Trac is also interesting especially if it can be made to work with git.
General developer forum
New bug tracker for Moodle.org
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