e107 is one of the best web application which provides you with a powerful platform to develop high end websites to suit your business requirements
TYPO3 is an open source CMS (Content Management System) and is being distributed for free under the GNU General Public License.
XOOPS is an Open Source Content Management System released under the GNU General Public License
Mambo is one of the most popular and powerful Content Management System (CMS) available. Simple and complex corporate websites can be created easily with the web based interface and the user friendly features of Mambo CMS
A Content Management System (CMS) is an application using which you can conveniently create and manage dynamic web content.