I am looking for ideas for a PHP/MySQL forum software that I can use on my website that does not require users to register. I'm not really sure how to explain this. It doesn't have to be an advanced forum, though if it could still have the appearance of vbulletin or Invision, that would be great.

The most important thing is that I want a forum that a guest to my website can post on, submitting their name at the time of the post. Don't need IM or any of that extra stuff.

Thanks in advance,

-Minolwen