Piwik is a downloadable, open source (GPL licensed) web analytics
software package. It provides detailed reports on your website and
its visitors, including the search engines and keywords they used,
the language they speak, which pages they like, the files they
download, and so much more.
Piwik aims to be an open source alternative to Google Analytics.
Submitted by: Wen heping <wenheping at gmail.com>