Content management software

We are looking for a good content management software for our portal website. If you already have a ready made solution, it would be good. We should be able to modify all the text, images, links etc from the browser itself. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Installation package that will install the software (in ready-to-run condition) on the platform(s) specified in this bid request. 3) Complete ownership and distribution copyrights to all work purchased. ## Platform Linux, MySQL, Internet Explorer