XOOPS is a popular CMS (content management system) written in PHP. It supports MySQL, and is an ideal tool for developing small to large dynamic community Web sites, intra-company portals, corporate portals, Web logs, and much more.
Kusaba X is a continuation of the Kusaba image board project. It allows you to make your own image board, similar to 2channel and 4chan. Unlike a lot of other image board software, it allows you to set up multiple boards and control them from one centralized management panel.