This Idealware report is targeted at nonprofits looking to replace an existing content management system, or implementing one for the first time. It looks at 14 popular available content management systems–Drupal, Ektron, Evoq, ExpressionEngine, eZ Publish, Joomla!, Luminate, NetCommunity, Plone, Squarespace, Weebly, Wix, WordPress.org, and WordPress.com–and what they do. It’s designed to help you get a sense of what you might want to look for, and then to dive in for a closer look at each of the systems. You’ll need to sign up for the free download.
http://www.idealware.org/reports/consumers-guide-content-management-systems-nonprofits