Few know CMS by me are :
Wordpress : Simple to learn can be customized to a large extent , most used CMS world wide , very old CMS in the market which is updated regularly, the only issue is security need to be updated and secured properly or it can get easily hacked.
Joomla: One more CMS with lots of development and themes available in the market , not that easy to learn
Drupal : Good Secure CMS application , with slow development.
I would like to know what are the best CMS for websites? Please give elaborated views than generic.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic