The two main content management systems are Drupalhttp://www.decisionstats.com/drupal/
and Joomla
http://www.decisionstats.com/joomla
These are two pages as test examples for the two different CMS’s.
Advantages of them are –
Easier to manage a lot of content
Disadvantages-
Difficult to configure as compared to wordpress
Less Attractive Themes or Plugins.
I preferred drupal precisely because it gives some added flexibilty in themes and editing content.