According to Wikipedia, Mambo was created by Peter Lamont in 2000. So what was the CMS/asset manager I used in 1997? It certainly wasn’t the same as either Mambo or Joomla! today, since it pre-dated PHP on which these packages are based. I need to do some Googling to figure out what I’m talking about.
Update: Okay, got it figured out. It looks like there are (or were) two different Mambos. The package I used in 1997 was MAMBO, the Media Asset Management By Objects from a company named WebWare. The URL for their website, webware.com, is now operated by CNet, so it appears WebWare (the company) is gone and with it the asset-management packaged I used ten years ago.