Add most popular groups and all groups on registration page

Hi,

I was wondering if there is a contrib to show a list of most popular groups and the list of the rest of the groups on the registration page. So most popular will be contain above alll groups ( which will exclude the most popular ones). I know how to add groups to the registration page. I looked and have not found a contrib module that does this yet. I'm just wondering if I this is something I will have to create custom. I just wanted to know if something like this exist before I invest time into creating a custom module.