- OpenSourceCMS: Try Open Source Demos.
- CMS Matrix: The Content Management Comparison Tool.
- Joomla! came into being as the result of the fork of Mambo.
- Comparing WordPress, Joomla, Drupal, and Plone, Idealware, March 2009.
- Why NASA Science chose Plone, April 27, 2009, and Plone.org news article, Apr 11, 2008, — the NASA Science site
- Migrating to Drupal: Why and how the Planetizen Web site migrated to the Drupal infrastructure for communities, September 30th, 2006. Good information on Drupal basics and how things work.
- IBM study, July 11, 2006, on how to design, develop, and deploy a collaborative Web site. Includes a comparison of several content management systems (Drupal, Mambo, Typo3, Ruby on Rails, Movable Type, WordPress, and TextPattern) and explains their decision to use Drupal.
- Discussion on an NTEN list, June 19, 2009 [you need to register to view] — organization has a customized website, wants to move to a more common platform, later message lists needs, suggestions include — find a developer before choosing CMS.