I'm developing a website that will be hosting articles, so I wanted to find a CMS that was specifically designed to post articles. I don't want it to post articles like a blog in chronological order. I need the articles to be grouped according to their subject and all of them displayed, not just recent ones. I think a search function would also be helpful, but not needed. I'd prefer the CMS to be open source and PHP.

Here are some open source CMS systems that use PHP and MySQL.

GeekLog: http://www.geeklog.net/

Joomla: http://www.joomla.org

PHPWCMS: http://www.phpwcms.de

phpWebSite: http://phpwebsite.appstate.edu/

PostNuke: http://www.postnuke.com

SiteFrame: http://siteframe.org/

Hopefully one of these will suit your needs.

PHP-Nuke.

http://www.joomla.org

Large selection of components and modules and a large community of support. It also has a built in blog system that allows you to create overall sections and categories within those.

google any of these :

phpnuke

postnuke

typo

geeklog

mambo

phpwebsite

Drupal