Back-end
   A PHP/MySQL application for creating and managing small and medium sized dynamic websites.
   http://back-end.org/

Open.Appideas.com: Projects
   A collection of tools that use MySQL. Including Web Interface, Shopping Cart, and Community Calendar.
   http://open.appideas.com/projects/

Phorum
   A web-based discussion software written in PHP that utilizes MySQL to manage its messages.
   http://www.phorum.org/

WCN:Talk
   An Open Source (GPL) Web discussion software written using Perl and MySQL.
   http://worldcommunity.com/opensource/wcntalk/