Many Web designers begin with WYSIWYG HTML editors like Dreamweaver or Frontpage, not realizing that there are easier ways to get things done — like using a free content management system!
Here are 10 top-notch open source content management systems that are powered by PHP/MySQL — in no particular order, except that I am biased towards Drupal ;)
Drupal is the winner in my book. This blog is running on Drupal so I'm a little biased. :)
Drupal is fairly easy to use once you get past the initial learning curve. Drupal is easier to customize than many other content management systems because of features like custom content types and the Views module.
WordPress is the classic blogging system. It's easy to install and there are a huge number of plugins and themes available. If you want a blog, you can't go wrong with WordPress.
Joomla is a powerful open-source content management system with a very active user community and many modules that you can add to increase functionality.
A top-notch example of a Joomla site is this Japan HDR photography site.
Textpattern is an elegant blogging/CMS platform that takes a while to get used to if you are coming from WordPress, but it is a top-notch system that powers many great sites like pvponline.com, the Museum of Contemporary Art in Jacksonville, and the Last.fm blog.
CMS Made Simple lives up to its name as being an easy system to install, configure, and use. It doesn't have as many features or as large of a user community as Drupal, WordPress or Joomla, but it's a good option if you want to get something online fast without much of a learning curve.
An example of a site using CMS Made Simple is Youth Action for Peace.
SilverStripe is a promising CMS that is built with an MVC coding framework, is modular, and licensed under the BSD license.
MODx is a new CMS that shows a lot of promise.
Pixelpost is a very simple, very cool photoblogging application that lets you easily upload and share photos.
Typo3 is known for having a brutally steep learning curve, but it is powerful enough to do just about anything.
Mediawiki is the wiki software that powers Wikipedia. It has a large amount of features, and is heavy-duty enough to run one of the most popular sites on the Web.
You can take the above content management systems for a test drive at OpenSourceCMS.com.