This page lists all known counter and tracker services, plus related resources. Note that a "counter" actually displays the number of visitors; a "tracker" displays either a counter or a logo, but also provides more site statistics if you click on the counter or logo. Some "counters" simply count accesses, but several services also provide detailed statistical reports.
How to do ...
There are 4 types of counters, CGI/Perl (most used), Java and Frontpage.
Either you can subscribe to a counter from a Counter Site "almost free", easy to setup in your pages, just follow the links ->