Down the 2011 Open Source CMS Market Share Report from water&stone. This is the 4th annual report of the industry's leaders, laggards and systems to watch. 62 pages. Over 30 exhibit. Lead analyst: Ric Shreves.
These guidelines are only suggestions on things that need to be considered when managing a web site or CMS. It is up to you to decide what is appropriate for you to implement for your sites.
CiviCRM is an open source and freely downloadable constituent relationship management solution. CiviCRM is web-based, open source, internationalized, and designed specifically to meet the needs of advocacy, non-profit and non-governmental groups.
A free (libre), open-source (GNU GPL) content management framework written in PHP with support for a number of operating-systems, web-servers and databases.
Drupal made international news following the U.S. White House's October 2009 web redesign. The variety of Drupal-powered websites demonstrates the platform's flexibility. Notable examples include British Medical Journal (BMJ); Stanford Law School, and Turner Broadcasting.