A free (libre), open-source (GNU GPL), content management platform designed for group collaboration. Open Atrium is based on Drupal (running on Apache, with a MySQL database).
CMS Made Simple helps experienced web developers and designers to create sites of power and beauty in a fraction of the normal time, avoiding hours of coding and allowing your clients to update their own sites with a minimum of fuss.
A flexible, elegant and easy-to-use content management system. Textpattern is both free and open source.
When it comes to publishing on the internet, beginners and experts alike are met with a bothersome paradox: word processors and graphics applications allow anyone to do a pretty good job of managing text and images on a personal computer, but to make these available to the worldwide web – a seemingly similar environment of documents and destinations – ease of use vanishes behind sudden requirements for multilingual programming skills, proficiency in computer-based graphic design, and, ultimately, the patience of a saint.
GSoC Student Application Deadline Extended Wednesday, 02 April 2008 Summer 2008 Credit: Luc Viatour The Google Summer of Code 2008 student application deadline has been extended to Monday, April 7, 2008. GSoC is a great way for talented student developer
Moodle is a course management system (CMS) - a free, Open Source software package designed using sound pedagogical principles, to help educators create effective online learning communities. You can download and use it on any computer you have handy (including webhosts), yet it can scale from a single-teacher site to a 50,000-student University. This site itself is created using Moodle, so check out the Moodle Demonstration Courses or read the latest Moodle Buzz.
TYPO3.org is the main developer resource of the TYPO3 project, a free CMS framework released under the GPL. This site provides lots of information about creating sites, writing extensions and developing the core of TYPO3.