A content management system (CMS) is a computer application used to create, edit, manage, and publish content in a consistently organized fashion. CMSs are frequently used for storing, controlling, versioning, and publishing industry-specific documentation such as news articles, operators’ manuals, technical manuals, sales guides, and marketing brochures. The content managed may include computer files, image media, audio files, video files, electronic documents, and Web content.
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.
Born as phpRadiant in January 2007, Frog CMS is a PHP version of Radiant CMS, a well known Ruby on Rails application.
Phenotype CMS 2.8
Phenotype CMS is a PHP/MySQL/Smarty based Open Source Content Management Framework dedicated to serve two basic principles: Easy Editing & Simple Efficiency.
Pixie is a free, open source web application that will help you quickly create your own website. Many people refer to this type of software as a content management system (cms), we prefer to call it a small, simple, website maker.
TYPOlight webCMS is a powerful web content management system that specializes in accessibility (back end and front end) and uses XHTML and CSS to generate W3C/WAI compliant pages. It was developed in 2004 and has been released under GNU/LGPL.
CMS MadeSimple 1.5.2
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.
Concrete5 is simple for site owners to use, and powerful for site developers to work with. After being a successful commercial app for years, concrete5 was just released as fully “free beer” in the summer of 2008. You owe it to yourself to check out c5.
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.
Powerful. Simple. Secure. Built around strict coding standards (W3C HTML valid) and simplicity, TangoCMS allows you to create and manage a site quickly and easily. Blogs, RSS Feeds, and a powerful Media module are just some of the features available.
Mambo is a full-featured content management system that can be used for everything from simple websites to complex corporate applications.