The leading open source content management systems (CMS) are WordPress, Joomla, and Drupal. WordPress and Drupal were the first on the scene in about 2004. Joomla arrived in late 2005 after splitting off from Mambo. Over the past 8-9 years, Joomla has risen, peaked, and declined. Drupal has grown steadily and continues to be a preferred tool of highly technical developers concerned with security and functionality. WordPress continues to grow in popularity and is the most popular content management system on the planet, according to trends.builtwith.com/cms. It is popular because of its ease of use and plethora of pre-designed themes that can be purchased for less than $100 and deployed in a matter of hours.