7th BBS 
A modular Bulletin Board System based on PHP 5 and MySQL 4+. [Open source, GPL]
http://www.7thbbs.com/
Bestweb 
Usenet style threaded discussion, multiple forums, multiple languages, automatic archiving, printable pages, and message voting.
http://bestweb.ca/
DCForum+ 
A PHP/MySQL implementation of DCForum web discussion program. [Commercial]
http://www.dcscripts.com/dcforump.shtml
FUD Forum 
Very feature-rich PHP forum system with MySQL/PostgreSQL backend.
http://fudforum.org/forum/
FunkBoard 
A multi-thread customisablebulletin board messaging system. It uses PHP and either MySQL or PostgreSQL database. [Freeware]
http://www.funkboard.co.uk/
IbPhp 
Ikonboard's PHP version. It supports all CGI version's features and it's free. A free registration is required to download the script.
http://www.ikonboard.com/
IceBB 
Open-source forum software in PHP.
http://icebb.net/
MBoard 
A simple message board for those who don't want or need large forums. Supports smileys, e-mail notification and more. [Freeware]
http://www.phpjunkyard.com/php-message-board.php
MercuryBoard 
Bulletin board written in object-oriented PHP4 with a MySQL database backend.
http://www.mercuryboard.com/
Oneiric Bulletin Board 
Oneiric is a free (GNU/GPL) PHP Bulletin Board with a mySQL backend.
http://www.oneiric.de/board/
OvBB 
A light-weight and fast bulletin board system that mimics vBulletin 2 in both look and behavior while incorporating new features and functionality. [Open source, MIT]
http://www.ovbb.org/
Oxygen 
A highly customisable open-source web-based bulletin board that requires PHP4, a mySQL database.
http://www.o2php.com/
PHP/XML Forum 
A free thread-oriented, XML-based news forum. No database required.
http://outer-court.com/tech/forum.htm
Phorum 
A free threaded, web-based bulletin board system written in PHP with a variety of backend database option available.
http://phorum.org/
Prattle 
A message board system implementing a clean linear model. [Open source, GPL]
http://prattle.sourceforge.net/
ProBB 
ProBB is a web bulletin board written in PHP and backed by several databases, including MySQL, MsSQL, and PostgreSQL.
http://www.halfstrike.com/probb/
PunBB 
News, information, downloads, newsletter subscription, international support, hosting and forums for the lightweight discussion board. [Open source, GPL]
http://punbb.org/
SEO-Board 
A fast, and search engine friendly forum software written in PHP/MySQL. [Open source]
http://www.seo-board.com
SMF 
A community software package with themes, fast message database, secure file-attaching system, and mod installation manager. [Freeware]
http://www.simplemachines.org/
SkaidonDesigns 
Template designer for phpBB, vBulletin, IPB software.
http://www.skaidon.co.uk
SowiBB 
Forum software written in PHP with a MySQL backend.
http://sourceforge.net/projects/sowibb
Supermod 
A PHP forum software to a higher level YABBSE based concept radically modified and customized for free.
http://www.supermod.org/
Transverse Styles 
Provides Invision Power Board skins and vBulletin styles. All skins and styles are packaged with fixed and fluid configurations. [Commercial]
http://www.transversestyles.com/
UBBThreads 
Threaded or linear viewing of posts, address books, CSS compatible, session or cookie based, moderators, multi-language support, private forums, profanity filter, and user pictures. [Commercial]
http://www.ubbcentral.com/
Unclassified NewsBoard 
Unicode-supporting PHP/MySQL forum software that produces standard XHTML and CSS. [Open source, GPL]
http://newsboard.unclassified.de/
UseBB 
A PHP/MySQL bulletin board package designed for small to medium sized web sites. [Open source, GPL]
http://www.usebb.net/
Vanilla 
PHP/MySQL forum software with multilingual support and more than 100 plug-ins. [Open source, GPL]
http://getvanilla.com/
W-Agora 
Free forum written in PHP. It has also a guestbook, a download area, a photo gallery and a news publisher feature. It uses MySql as database.
http://www.w-agora.net/
WMForum 
A very simple discussion board program written in PHP. It doesn't use any SQL database.
http://wmforum.lehed.com/
WSN Forum 
Fully customizable, extensible and translateable PHP/MySQL forum script. [Commercial]
http://www.wsnforum.com
WiForums 
Interoperable (vBulletin, phpBB2 and IPB) Web/WAP Discussion Forums for Cell phones, PDAs and other handheld devices.
http://www.wiforums.net
WowBB 
WowBB offers features such as auto install/upgrade, a WYSIWYG editor with integrated spell-checker, auto time zone detection and smart caching. Requires PHP and MySQL.
http://www.wowbb.com
XMB 
PHP/MySQL forum software that supports themes, BB code, and instant messaging. [Open source, GPL]
http://www.xmbforum.com
Xsorbit 
Free forums and professional message board and forum software for personal or business use.
http://www.xsorbit.com
YaBB SE 
A PHP/MySQL port of Yet another Bulletin Board (YaBB) 1 Gold (see above).
http://www.yabbse.org
aterr 
An open-source, web-based, threaded forum system written in PHP, supporting nested posts and forums.
http://chimaera.starglade.org/aterr/
bSpeak Threaded Messageboard 
A PHP and MySQL based messageboard software. [Commercial]
http://www.26thavenue.com/index.php?action=products.bspeak
bbPress 
Template-driven PHP/MySQL forum software developed by the creators of WordPress. [Open source, GPL]
http://bbpress.org/
ccForum 
A simple, easy to use message board system. It supports single or multiple forums, user registration and anonymous posting, and forum administrators. ccForum is written in PHP and is based on a MySQL database. [Open source, GPL]
http://ccforum.sourceforge.net/
ezPhpForum 
A simple to use PHP forum package.
http://www.ezphpforum.com
miniBB 
Small, fast and free discussion board system written in PHP, can be based on any database supported by PHP (including mySQL and PostgreSQL).
http://www.minibb.net/
myBB 
Coded in PHP and backed by mySQL. Free
http://www.mybboard.com/
phpNet 
A feature enriched PHP/MySQL message board.
http://php-net.net/
tribbyBoard 
A free threaded message board script written in PHP with a MySQL backend.
http://www.tribby.com/board/
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