One of the most popular blogging platforms available, WordPress is a fantastic CMS with a large number of free plugins and templates available.

Equipped with a powerful blend of features, Drupal can support a variety of websites ranging from personal weblogs to large community-driven websites.

Mambo is a full-featured content management system that can be used for everything from simple websites to complex corporate applications.

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.

Skeletonz is a new content management system (CMS) based on Python. It differs from othrs by being simple, but yet very powerful and extensible. If you need a simple system that you and your users are going love then Skeletonz might be the solution you are looking for. (http://orangoo.com/skeletonz/)

sNews is a completly free PHP and MySQL driven tool for publishing and maintaining news articles on a website. Integrating sNews into your existing design is simple, but you could also use sNews on it\'s own, as a simple Content Management System. Consisting of only one file, sNews is extremely lightweight, very easy to install, and easy to use via a simple web interface.

Oh Yeah! Full Java for Mysql & Oracle databases. Free and open source.

SPIP is a publishing system developed by the minirézo to manage the site uZine. We provide it to anyone as a free software under GPL license. Therefore, you can use it freely for your own site, be it personnal, co-operative, institutional or commercial. http://spip.net

MODx is an open source PHP Application Framework that helps you take control of your online content. It empowers developers and advanced users to give as much control as desired to whomever they desire for day-to-day website content maintenance chores.