- Joomla! 1.5 Bug Reporting
- Joomla! 1.5 Coding
- Joomla! 3 Beta Support (although arguable whether any version of Joomla—including betas—are supported via this self-help forum, but that's another story)
And while I'm at it, there's an interesting forum category entitled JoomlaCode.org. While JoomlaCode.org is effectively "closed" (i.e. Joomla development has moved to GitHub) and has been inactive for the past four years, the URL remains as a place where people may be able to find resources applicable to ancient software. It's fair enough that JoomlaCode.org should remain (and that there's a menu item on this website under Developer Resources » JoomlaCode) but I don't see the need for new or ongoing discussions about. Let's archive this forum category, too, but let the forum moderators post annoucements if there should be any in future.