We just added a new page to our site with brief profiles of some of our customers forums. While many forums tend to be private and hidden behind paywalls, some portions of the ones on this page are public.
Check it out here: https://simple-press.com/showcase/
Building out your membership site can be a lot of work. Easy Membership Sites has pre-configured all the Simple:Press plugins and tools you need to build a complete membership site in a fraction of the usual time. Check them out: Easy Membership Sites