A content management system is software that keeps track of every piece of content on your Web site, much like your local public library keeps track of books and stores them. Content can be simple text, photos, music, video, documents, or just about anything you can think of. A major advantage of using a CMS is that it requires almost no technical skill or knowledge to manage. Since the CMS manages all your content, you don't have to.
More popular CMSs are on http://php.opensourcecms.com/
For example:
- Portial：phpnuke, Xoops ,Joomla
- Forums：phpbb ,discuz, smf, vbb, ipb
- eCommerce：osCommerce, phpShop
- Blogs：Lifetype, Wordpress, Movable Type
Joomla homepage in taiwan: http://www.joomla.org.tw/
