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YaBB SE is a PHP/MySQL port of the popular forum software YaBB (yet another bulletin board). YaBB SE incorporates the same intuitive user interface, and several of the most popular modifications from YaBB's Boardmod project. Main features: MySQL DB Backend - improved reliability and load handling, PHP Driven - easier website integration, Package Manager - easy mod installation and download, Polls, Attachments, New display options - VB style login, SP1 Info center and more, New 'installed mods' admin center, HTML 4.01 compliant, Web-based installer and Y1G converter, tha ability to Host multiple YaBB SE's in one DB.
Price: Free

YapBoard is a messaging board system written in PHP for Apache and MySQL. It supports automatic generation of user accounts, and aims to be simple and easily customizable.
Price: Freeware

YapBB is a PHP/MySQL-driven software thatallows you to set up your own forum board on your site. Some of its current features include: Full featured bulletin board system, Full configurability, server-side, Many per-user options using a cookie-based system, Different authentication levels, Optionally count the views for a topic to see how popular it is, Optionally spread out long topic-lists and topics over multiple pages to save on load times, A complete set of emoticons for us in messages, Special tags that allows you to mimic HTML functionality, Multiple moderators per forum, A hierarchical stucture of Categories, Forums, Topics and Posts, See which people are online on ICQ and send ICQ messages to those persons, See which people are logged in, Login once, and stay logged in until you closed your last browser window, Certain malicious pieces of texts are automatically filtered out, Complete control over HTML-tags in various fields, A password mailer, A special field in the user-table, which admins can use to store notes about certain users, and more.
Price: Free (GPL)

Zorum is an easy to install Web-based forum, message board, or bulletin board.It requires a MySQL database,and the PHP4 script module. Features include: web based easy install, embedded administration, personalization, moderators, password reminder, post blocking rules, bb code, mark unread messages, subscriptions, attachments, ratings, polls, smilies, word censoring, search, statistics and more.
Price: Free