Simple & Free PHP Stats Script – ChiliStats
Almost every website owner tracks the statistics of their websites with the free and powerful Google Analytics.
The service has made a huge step forward with its "live stats" feature which shows the instant activity.
There are very few reasons left to use another solution to track stats where one of them is the lack of "live overall stats" (as Google Analytics still displays the overall stats with a delay) and the other is the need for using an open source system.
The application is free, open source, built with PHP and uses MySQL for storing the data.
It presents a snapshot of the statistics -supported with charts- in a "OneView" page and sub-pages for viewing top-referrers, visited pages or referring keywords exist. And, a "History" page allows digging the statistics of past months.
ChiliStats also offers a stats counter widget to be integrated inside web pages.