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CushyCMS is a Content Management Systems (CMS) that is truly simple. It’s free for unlimited users, unlimited changes, unlimited pages and unlimited sites.

Drupal is a free software package that allows an individual or a community of users to easily publish, manage and organize a wide variety of content on a website. Tens of thousands of people and organizations are using Drupal to power scores of different web sites

Frog CMS simplifies content management by offering an elegant user interface, flexible templating per page, simple user management and permissions, as well as the tools necessary for file management. Born as phpRadiant in January 2007, Frog CMS is a PHP version of Radiant CMS, a well known Ruby on Rails application. Although the two applications still share a family resemblance, Frog is charting its own development path.

MODx helps you take control of your online content. An Open Source PHP application framework, it frees you to build sites exactly how you want and make them 100% yours. Zero restrictions and fast to build. Super-simple templates in regular HTML/CSS/JS (any lib you want). Registered user systems and a killer community. Welcome to web-building nirvana.

The SilverStripe CMS is a flexible open source Content Management System that gives everyone involved in a web project the tools they need to do their jobs.

WordPress is a state-of-the-art publishing platform with a focus on aesthetics, web standards, and usability. WordPress is both free and priceless at the same time. Wordpress is also what Spyre Studios and Design Newz run on (as well as my blog design website and my Guerrilla Freelancing blog).