Counter & Visitor statistics 2.0
Counter & Visitor statistics is not only a PHP counter tool but also a visitor registration and statistic tool. Version 2 is a replacement of the old count_visitor class. There are lot of good systems like this script but most of them are really complex and difficult to modify.
You have to use this kind of systems like provided. This script is not an alternative if you look for the same amount functions, but it's a light weight solution to integrate into your website.