For a school project I have to make a community and we chose to have a phpBB forum as a part of it. Thing is, the community should be completely open, so you don't have to register or login to post or be a part of it. I've set the permissions so that guests can post, but I can't find anything to enable guests to open topics.
I realize this would open the forum for spammers and such, but I've discussed it with the rest of my group and we've chosen to take that risk.