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phpMyChat is an easy-to-install, easy-to-use multi-room PHP/DB chat. It is currently available for MySQL, PostgreSQL, and ODBC, and the work on Oracle is in progress. It supports IRC-like commands, moderators, and is available with 37 languages.
PHP/MySQL Discussion Forum with frames-based layout, reply-to-user, e-mail notification, HTML-posting, signatures, friends & killfiles, user promotion/demotion and full admin tools.
Internet Discussion Boards is a message board system by Game Maker 2k. Its very easy to set up. Your web host needs PHP and MySQL/PostgreSQL/SQLite. Internet Discussion Boards is Open Source so you can make changes to it.