BBClone - A PHP Web Counter
For each visitor, BBClone counter can display: IP address with reverse DNS, whois information, operating system, browser, referring URL (where do they come from), visit date, search engine keywords, country, page visits and number of visitors in a graphical interface. Additionally referrers and ip addresses can be ignored if necessary. No database is required, just add a few lines into the PHP pages to be tracked and the code does not appear in the source.