PHPNuke

PHP-Nuke is a web based automated news publishing and content management system or Web CMS (a "nuke"[citation needed]) based on PHP and MySQL. The system is fully controlled using a web-based user interface. PHP-Nuke was originally a fork of the Thatware news portal system.

Features:

The main aim of PHP-Nuke is to allow a webmaster to create a community-based portal, with an automated web site allowing users and editors to post news items (user-submitted news items are selected by editors). Users can comment on these articles using the comments system.
Modules may be added to the PHP-Nuke system, allowing the webmaster to add more features (such as an Internet forum or calendar) to their PHP-Nuke installation in addition to the core modules such as News, FAQ and Private Messaging. The whole system is maintained by administrators using the web-based administration section.
PHP-Nuke is able to support a number of different languages. Its look and feel can also be customized (to an extent), using the Themes system, although some people have found it difficult to make the site look any different from the standard ⅔ column layout (as used by the program's official website , but with some knowledge on PHP, HTML and CSS the results can be impressive. (www.phpnuke.org)