PunBB is a powerful forum system programmed in PHP, it characterizes for its speed and low consumption of resources.

It incorporates the features a forum can provide: browsers, avatars, user register, user profiles, etc.

You can personalize the forum with skins, which you can edit as you like. If you are looking for a forum for your web site that is free, customizable and powerful, PunBB has to be your choice.