I didn't own any but I was staff at a few. MadCoke obviously, I think I was a mod or admin at some point in exchange for
terrible,
terrible,
terrible graphics.
There was another one I vaguely remember that I think may have also been owned by Vis? I remember it being blue, I think Invision was the board software and I remember it had a forum plugin for this army type game that everyone was addicted to.
There was another one that was big in the early days, before madcoke and the others. I don't remember the name at all but I remember it was yellow and one of the staff members was 404 who I think coded the site. It was all custom coded from what I remember.