Drupal is software that allows an individual or a community of users to easily publish,

manage and organize a great variety of content on a website.Equipped with a powerful blend of

features, Drupal supports a variety of websites ranging from personal weblogs to large

community-driven websites.

URL: http://drupal.org/

2. WordPress

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.

URL: http://wordpress.org/

3. Joomla!

Joomla! is one of the most powerful Open Source Content Management Systems on the planet.

It is used all over the world for everything from simple websites to complex corporate

applications. Joomla! is easy to install, simple to manage, and reliable.

URL: http://www.joomla.org/

4. CMS Made Simple

CMS Made Simple is an open source (GPL) package, built using PHP that provides website

developers with a simple, easy to use utility to allow building small-ish (dozens to hundreds

of pages), semi-static websites.

URL: http://www.cmsmadesimple.org/

5. Simple Machines Forum

Simple Machines Forum – Simple Machines Forum is a free, professional grade software

package that allows you to set up your own online community within minutes.

URL: http://www.simplemachines.org/

6. Mediawiki

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.

URL: http://www.mediawiki.org/wiki/MediaWiki

7. Pixelpost

Pixelpost is a very simple, very cool photoblogging application that lets you easily upload and share photos.

URL: http://www.pixelpost.org/

8. MODx Revolution

MODx Revolution is a powerful PHP Content Management Framework that plays nicely with custom code and helps you build sites faster and maintain them with ease.

URL: http://modxcms.com/

9. Typo3

Typo3 is known for having a brutally steep learning curve, but it is powerful enough to do just about anything.

URL: http://typo3.com/

10. Textpattern

Textpattern is an elegant blogging/CMS platform that takes a while to get used to if you

are coming from WordPress

URL: http://textpattern.com/