Top 5 free content management systems

1) CMS made simple

Features

• Easy User and group management
• Group-based permission system
• Admin panel with multiple language support
• RSS module
• Module API for easy extendability

Front-end Demo here
Admin Demo here
username: admin
password: demo

2) DragonFly CMS

Features

• Built-in photo gallery
• BBcode support
• MMCache and eAccelerator support
• Site-wide cache-based template system
• Debugging system and page query list

Front page demo here
Admin Demo here
Username: admin
Password: Demo123 (Case Sensitive)

3) Bitweaver

Features

• SEO friendly urls
• Content spam protection (automatic no-follows)
• Many formats supported (TikiWiki, HTML, BBCode, Wikipedia (aka MediaWik))
• Hotwords - allow you to specify particular words that can be associated with a URL
• Generate PDF documents from all Content

Front-page demo here
Admin demo here
Username: admin
Password: demo

4) Drupal

Features

• SEO Friendly URLs
• Many community modules
• Role based permission system
• External authentication source support with Jabber, Blogger, and LiveJournal
• Blogger API support

Front-end demo here
Admin demo here
Username: admin
Password: demo

5) Joomla

This is one of the most mature, free (did I mention open source), content management systems available. Also a fork of a CMS called Mambo. How are they different?

Joomla version 1.0 is derived from Mambo 4.5.2.3 but includes many additional bug fixes and security patches. Joomla version 1.5 is an extensive refactoring of the API as is Mambo version 4.6 to its codebase. Both applications continue maintain a similar user inferface (look and feel), similar default component and module sets. Both Joomla 1.5 and Mambo 4.6 will include internationisation support. Joomla will use an easy-to-use ‘ini’ format for their translation files while Mambo uses the ‘gettext’ format. Joomla 1.5 will correctly support the UTF-8 character set. Joomla 1.5 also includes many new features such as additional authentication models (LDAP, Gmail, etc), xml-rpc client-server support. It also natively supports database drivers for MySQL 4.1+ (on PHP 5) and has improved support for MySQL 5 as well as the groundings to support other database engines.

Demo here