Most Comprehensive Web 2.0 List ever:
Most Comprehensive Web 2.0 List – CMS 2.0
Drupal – Online CMS. http://drupal.org/
Ekklesia – CMS for churches. http://www.ekklesia-systems.com/
Loudblog – CMS inc. RSS. http://www.loudblog.de/
Pligg – Includes social tools. http://www.pligg.com/
Pmachine – CMS. http://www.pmachine.com/ee/
Tinymce – Wysiwyg editor. http://tinymce.moxiecode.com/