MODx is an open source PHP application framework and CMS for creating modern web apps. It allows developers and advanced users to get as much control as needed. It is not only a CMS, but a framework at the same time, making it a CMF, and one of the best at it.

Features of MODx:
- Strong Web standards support
- Ajax enabled
- PHP application framework included
- Cross-browser tested
- Graphic installer
- WYSIWYG editing
- Menu manger
- PAge management
- User administration
- Nicely crafted admin backend
- SEO customization options
- User sessions management
- Error handling
- Themes
- Add-ons
- Custom Content Types
- Documentation

Requirements:
- PHP 4.3.11 or Higher
- Apache 1.3 or Higher
- GD library
- SimpleXML
- PDO
- Freetype
- MySQL, PostreSQL or SQLite PDO drivers
- mcrypt + mhash
- SOAP
- 64MB (or higher) Memory Limit
- MySQL 4.1.20 or higher
- Ability to override server configuration via .htaccess files
- SSH access with sudo privileges
- Permissions to edit PHP, Apache and MySQL config files
- Firefox 3 or Safari 3.1.2 or later for the Manager

What's New in This Version:
- Preserve GET parameters for container_suffix redirects
- Allow custom FURLs via URL rewriting again
- Fixed request_method_strict with FURLs off
- Added ability to extend manager session by relogging in without leaving manager screen
- Added better handling for AJAX exceptions, displaying AJAX errors
- Added wizard for User Group creation to speed up ACL workflow
- Added Context policy for proper managing of access to non-mgr Contexts
- Added wizard for Resource Group creation to speed up ACL workflow