Has anyone used a database besides Mysql? I have not seen any posting referencing any other DB.

I found my answer after digging in the documentation some more. Here is the link: https://xoops.org/modules/smartfaq/faq.php?faqid=98

After I get a couple of XOOPS sites up and running, I may go back and look at using other db's as well as Mysql.

This Q&A was found on XOOPS Web Application System : https://xoops.org/modules/smartfaq/faq.php?faqid=467