Simple Spreadsheet Javascript PHP
http://www.simple-groupware.de/cms/Spreadsheet/Home
Chyrp - Blogging Engine PHP MYSQL AJAX CMS
http://www.chyrp.net/
Pureedit - Simple PHP MySQL CMS
http://www.pureedit.com/
Symphony - XML XSLT CMS Framework
http://21degrees.com.au/products/symphony/
Drupal CMS
http://www.drupal.org