Good hosting CMS for Webmin?

[Qub1]

Hi, I am looking for a good content management system that allows me to set up hosting with Webmin (a control panel like cPanel).

I would like it to have automatic registration, billing, package management, reseller hosting and a place where users can manage their files and databases. It should all be automated, if possible.

Would there be such a thing available for free if possible?

Thanks in advance!