Here’s a good article from Juicy Studio on choosing a CMS with accessibility and other considerations in mind. The highest ranked were Quick and Easy, Plone, and Drupal (with “some customisation”).
The criteria used in the testing were:
- functional, accessible and usable to authors with minimum experience
- an accessible Web content management solution on a limited budget
- the WYSIWYG editor should be accessible to screen reader users (JAWS and Window Eyes), and easy to use
The CMS’s evaluated were:
- Quick and Easy
- Expression Engine