"A content management system (CMS) is a system used to manage the content of a Web site.[1] Content management systems are deployed primarily for interactive use by a potentially large number of contributors." - Wikipedia

The Best Stable PHP (using MySQL as database) Content management system under GPL license is......
1) Drupal
2) e107
3) Joomla!
4)PHP-Nuke
5)phpWebSite
6)WordPress
7)XOOPS
MODx
9)Mambo

Your opinion please.....
Eventhough there are lot of CMS available, I listed some popular CMS.