WordPress is used by over 18.9% of the top 10 million websites as of August 2013.
WordPress was originally used as CMS for blogs but recently gained a lot of popularity also for corporate websites for it’s ease of use and short time to market.
As of July 2013, Joomla has been downloaded over 35 million times. Over 6,000 free and commercial extensions are available from the official Joomla! Extension Directory, and more are available from other sources. It is estimated to be the second most used CMS on the Internet after WordPress.
Drupal is used as a back-end system for at least 2.1% of all websites worldwide ranging from personal blogs to corporate, political, and government sites including whitehouse.gov and data.gov.uk. It is also used for knowledge management and business collaboration.
As of August 2013, there are more than 22,900 free community-contributed addons, known as contributed modules, available to alter and extend Drupal’s core capabilities and add new features or customize Drupal’s behavior and appearance.
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