How about tasting Vanilla?
Vanilla is a free and open-source forum software easy to install and with a huge amount of add-ons.
I liked this software because the core software that you install is an simple forum. Maybe too simple for most people, because it doesn’t even bring a WYSIWYG editor. I wish that I’ve found this software some months ago. I needed to install a forum system in some client website, but they wanted something simple and fully integrated in their website design. I found a poor solution then, because I wanted to avoid PhpBB. It’s great but it was too big.
Next time I’ll give a chance to Vanilla.
