Free and Open Source Content Management System (CMS)

A content management system (CMS) is a collection of procedures used to manage work flow in a collaborative environment (quoted from wikipedia). It provides authoring and other tools designed to allow users with little technical knowledge of programming languages or markup languages to create and manage content with relative ease. Most web CMS use a database to store content, metadata, or artifacts that might be needed by the system. Content is commonly stored as XML, to facilitate, reuse, and enable flexible presentation options.

For those of you who are interested, I have here a list of some of the most well-known open source content management systems (CMS) available:

Joomla is an award-winning content management system (CMS), which enables you to build Web sites and powerful online applications. Many aspects, including its ease-of-use and extensibility, have made Joomla the most popular Web site software available. Best of all, Joomla is an open source solution that is freely available to everyone.

Drupal is a free software package that allows an individual, a community of users, or an enterprise to easily publish, manage and organize a wide variety of content on a website.

Movable Type is a weblog publishing system written in Perl. It supports storage of the weblog's content and associated data within MySQL, PostgreSQL, and SQLite.

WordPress started in 2003 with a single bit of code to enhance the typography of everyday writing and with fewer users than you can count on your fingers and toes. Since then it has grown to be the largest self-hosted blogging tool in the world, used on millions of sites and seen by tens of millions of people every day.
Plone is a powerful, flexible Content Management solution that easy to install, use and extend. Plone lets non-technical people create and maintain information using only a web browser. Perfect for web sites or intranets, Plone offers superior security without sacrificing extensibility or ease of use.

PHP-Fusion is written in PHP and MySQL and includes a simple, comprehensive adminstration system.

XOOPS is a web application platform written in PHP for the MySQL database. Its object orientation makes it an ideal tool for developing small or large community websites, intra company and corporate portals, weblogs and much more.