Forum on Ghost site

I see lots of documentation and discussion about using forum software like Discourse for post comments, but very little about setting up a separate forum within a Ghost site. I’m thinking about trying to have one on my site for general discussions, limited to logged-in members – so it would have to tie into the Ghost membership system in some way.

Has anyone done this? What forum software did you use? Were you able to link it to the memberships? Did you embed it on your site, or just jump to the forum on another host?

Any experience or guidance appreciated. Thanks!

Going to bump this just once.