PhotoPost PHP
Add PhotoPost to your site, or let us install it for you, and your visitors will be able to upload their photos to galleries on your site and interact in photo discussions. Join the 3,500+ sites that are already using PhotoPost and add a fun new dimension

vBulletin
vBulletin is a powerful, scalable and fully customizable forums package for your web site. It has been written using the Web's quickest-growing scripting language; PHP, and is complimented with a highly efficient and ultra fast back-end database engin

Aspin: ASP Forums
A small directory of ASP bulletin board and forum scripts, over half of which are free.

Chipmunk Forum and Message Board Script
Chipmunk Forum is a small yet flexible and fully featured forum system. It has unlimited categories and forums, staff only forums, read only forums, 4 levels of permissions. Smilies, word filters, BBcode, Ip banning, e-mail ban from registration and much

Matt's Script Archive: WWW Board
WWWBoard is a threaded World Wide Web discussion forum and message board, which allows users to post new messages, followup to existing ones and more.

phpBB.com
phpBB is a high powered, fully scalable, and highly customisable open-source bulletin board package. phpBB has a user-friendly interface, simply and straightforward administration panel, and helpful FAQ.

Toast Forums
Toast Forums is the first user-skinnable ASP message board on the Internet. It allows users visiting your website to dynamically choose the skin for your message board. Toast Forums also has all the features of an advanced message board. Download your fr

YaBB
Free open source forum software. Uses Perl and CGI