Piwik, an open source alternative to Google Analytics, is a downloadable, open source (GPL licensed) real time web analytics software program. It provides you with detailed reports on your website visitors: the search engines and keywords they used, the language they speak, your popular pages, …

Piwik is a PHP MySQL program that is installed your own webserver. At the end of a five minute installation process, a JavaScript code is generated that you embed in the webpages you want to track.