Vanilla Forums 2 has been released. It is a simple, lightweight, open-source forum software that support add-ons and customized themes.
I was looking for a bbPress forum alternative (lightweight, highly customizable, open-source, etc) and I found Vanilla Forums.
I have tried Vanilla 2 beta for a couple months. It is exactly my ideal forum: simple, clean, focus on threads (instead of forums), support add-ons and themes, etc.
Why not bbPress?
bbPress is great piece of open-source forum script backup by WordPress but the development is toooooo slooooowww.
The latest stable version of bbPress (version 1.0.2) was released 1 year ago! Matt Mullenweg, the founding developer of WordPress, was only recently updated bbPress blog, 7 months 2 days since his last post.
Once, I almost thought bbPress was dead…
Therefore, Vanilla Forums with active developments and strong support forums is my pick of lightweight forum software.
P.S. It is easy to integrate Vanilla Forum to WordPress blog, too!