I doubt anyone knows about it, but I really like the design of WoltLab Burning Board 3.

I feel like the visual layouts of forums (like the one I mentioned) lend themselves to better social interaction between users and let them get to know each other more easily. On here, I often see posts from the same people across communities, but it only becomes apparent to me after some time because the design is very minimalist (there's really just a name over the comment), whereas in forums everyone creates their own profile picture and text and a signature; that makes everything more personal, I think. I can appreciate both though.