Here is a list of a few popular Open source Web based Content Management system (CMS).
CMSimple is a free content management system. It aims to be simple, small and fast. As it is written in PHP it runs on Linux/Apache servers, or on Win32 with Apache or IIS. It doesn’t require any databases and it recommended for small site with less than 2MB text.
Cyclone3 is a free, open source modular content management framework and content management system engine. It is the first open source CMS using Mozilla Application Framework and has XUL administration frontend. It is licensed under the GNU General Public License.
Cyclone3 requires Perl and MySQL DB.
DotNetNuke is an open source web application framework written in VB.NET for the ASP.NET framework. The application’s content management system is extensible and customizable through the use of skins and modules, and it can be used to create, deploy, and manage intranet, extranet, and web sites.
Joomla! is an award-winning Content Management System (CMS) that will help you build websites and other powerful online applications. Best of all, Joomla! is an open source solution that is freely available to everybody.
Joomla! requires PHP and MySQL DB.
Mambo is a full-featured content management system that can be used for everything from simple websites to complex corporate applications.
Mambo requires PHP and MySQL DB.
The fully browser based user interface features configurable editors for structured content with well defined fields. Alternatively, content can be created using an integrated WYSIWYG editor similar to well known office applications. A sophisticated template engine enforces a site-wide corporate layout and W3C standard compliance for all content.
OpenCMS requires Java and works on most databases.
WordPress CMS 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 hundreds of thousands of sites and seen by tens of millions of people every day.
Wordpress requires PHP and MySQL Db.
XOOPS is a program that allows administrators to easily create dynamic websites with great content and many outstanding features. It is an ideal tool for developing small to large dynamic community websites, intra company portals, corporate portals, weblogs and much more.