CMS code base comparison
Drupal

Joomla!

Wordpress

Plone

(These graphs depict statistics for the core of each project, and do not include contributed modules, extensions or third-party plugins.)
Conclusions
- All projects have been growing in size. No exceptions.
- Drupal has, by far, the smallest code base. It's lean and mean. Joomla!'s code base is about 8 times bigger than Drupal's. Even Wordpress's code base is larger than Drupal's.
- Of all tools, the WordPress code has the fewest code comments. Drupal and Joomla!, on the other hand, have the best documented code.
— Dries Buytaert
Dries Buytaert is an Open Source advocate and technology executive. More than 10,000 people are subscribed to his blog. Sign up to have new posts emailed to you or subscribe using RSS.