Open Source forum software that isn't phpBB?

So while I was working on getting back into phpBB development and updating all my mods to phpBB 3, I got a few doors shut in my face.  I was always a phpBB outsider, never submitting my mods to the official database.  However, I never felt closed out, until now.

So I've posted a story on Slashdot that hasn't hit the front page yet, and I could use your help getting it there.  The story should open up discussion of the best Open Source alternatives to phpBB.  Is it Phorum?  Is it FluxBB?  Is it something else?

Please, log into Slashdot and then view my story.  There is a +/- graphic embedded in the title, and if you hit that "+" icon you'll give my story a boost.  I'd really appreciate opening a dialogue with all of Slashdot.  It may give me insight into products I don't even know about yet.  Thanks!