Piwik aims to be the open source alternative to Google Analytics, and it's gaining fast. Piwik runs on PHP and MySQL; provides a drag-and-drop, widget-driven AJAX dashboard; allows you to track any number of Web sites; and supports multiple user accounts with basic access controls. Plug-ins are available for geolocation and to automate the insertion of Piwik JavaScript code into the pages of Drupal, Joomla, WordPress, and other publishing platforms.