As part of a recent project to modernize and improve rt.cpan.org, we took the time to clean up and better abstract the various plugins we use on the backend. We've also (finally) moved all the RT extensions that make up the UI to a public SVN repository.
You can get at the code via svn://svn.bestpractical.com/
We use the following extensions.
CPAN specific UI and public bug tracking:
We also have a set of tools which import info from the PAUSE and
other sources into RT's Database, but we still need to clean those up a bit (removing hardcoded passwords, little things like that) before we can publish them.
If you've been hankering for a new feature in rt.cpan.org, now's the time to start sending patches. After 3 good patches, we'll grant you a commit bit to the rt.cpan.org extensions. You can start sending your patches to the address listed on the front page of rt.cpan.org