If anyone would like to try out new FREE forum software written in PHP then
check out class-1 forum

http://www.class1web.co.uk/forum/index.php

Features

class-1 Forum Software is a PHP/MySQL driven web forum. It is fully
functioning and offers the following advanced features;

Easy setup wizard routine.

Set up user groups and give them specific permissions to forums.

Full control over banning users and IP addresses.

Full moderation control over forums allowing post editing, locking, etc.

Private message facility with inbox and sent items.

E-mail users from within the software.

Full search facility.

Message purge.

Word Censoring and automatic replacement.

cookie support to allow users to stay logged in between sesssions.

Fully secure.