High powered, fully scalable, and highly customizable Open Source bulletin board package with a large support community.

Meet Vanilla: a new kind of web forum! Vanilla is a PHP/MySQL forum solution that is 100% open-source. With Vanilla, we wanted to break the mold created and followed by just about every other forum on the web.

PunBB is a fast and lightweight PHP-powered discussion board. It has fewer features than many other discussion boards, but is generally faster and outputs smaller, semantically correct XHTML-compliant pages.

Phorum is a web based message board written in PHP. Phorum is designed with high-availability and visitor ease of use in mind. Features such as mailing list integration, easy customization and simple installation make Phorum a powerful add-in to any websi

Elegant, powerful, easy, and free! Simple Machines Forum is the next-generation community forum software package that is jam-packed with features, while at the same time having a minimal impact on resources.

Free forum software.

FUDforum is a highly customizable forum package, with a large feature set. The easy to use administration control panel allows the administrator to easily configure and control the many features available. The forum also includes an interactive help packa

Zorum is message board software, which may be used on both intra- and internet sites. Zorum may be customized easily by adding or subtracting desired features.

MercuryBoard is a powerful message board system dedicated to raw speed with a mixture of features, ease of use, and ease of customization coupled with expandability, and diverse language services. Now just over two years in the making, version 1.0.0 is an

A sub-15k PHP simple Forum. Users can create new groups, topics and threads and reply to other threads. Wiki-like. Database free, TinyPHPForum uses text files only. Foolproof, easy, quick, tiny. No advanced features.

miniBB (an abbreviation of "minimalist bulletin board") is a flat-type (not threaded) free web forum and discussion software, open source PHP bulletin board.

Beehive is an open-source project for creating a high-configurable frame-based discussion forum.

freeForum is a free and simple discussion board script which can be fully integrated with your existing page layout. You'll need less than 3 minutes to get it working!

MyTopix by Jaia Interactive was designed with the smaller sites and close-knit communities in mind. It has many features that other boards have minus all the bloat -- support for avatars, image uploading, etc, its all there.

k4 Bulletin Board is a full featured open source bulletin board solution. Includes AJAX, multilingual support, template system.

Unique forum application that looks remarkably like Outlook Express.

PHPTB Topic Boards is one of the fastest forums on the net yet very powerful, with three different admin areas for total control over your board.

W-Agora is a web publishing and forum software. It allows you and your visitors to store and display messages, files, share discussions and other information on your web site.

SEO-Board is a forum software that's fast, free, and search engine friendly. It is the perfect solution for small and medium-sized sites.

Navboard is a php based web forum using text files to store data instead of using a database, compatible with any server running php 4.0 or higher, all the features of most major forum software and no installation needed.

UltimaBB is the safest, fastest, easiest to use, fully-featured bulletin board software. Derived from the popular XMB Software and refined and extensively enhanced, UltimaBB is designed to offer the best forum experience.

A new, professional, clean way of discussing topics.

A light, open source, PHP/MySQL, efficient forum package developed with simplicity and usability in mind.

FluxBB is a free open source forum application designed to be fast, light and user friendly. Features include: semantic and valid XHTML and CSS, support for MySQL, PostgreSQL and SQLite, easily translated into any language, one click install extension system and full support for UTF-8.