Counters are hosted, meaning the program that runs them and all of the information it records is kept on a server long out of your reach. Hit counters and trackers can give a Webmaster an indication of a Webpage's popularity, where visitors are entering from, search engines/terms and other demographic information.
eXTReMe Tracker
High quality free stats, requires a small icon on your site. Tells you how many visitors you get, exactly how each one of them gets there, what browser, resolution, what operating system they are using, and what country they are coming from.
Superstats
SuperStats, the world's most comprehensive, free web site tracking tool.SuperStats tracks: Page views, Unique Visitors, Referrers, Search Engines, Operating Systems, Browsers, Domain Names, Plug-ins, Countries Languages, Visitor Profiles, etc.
TheCounter
With TheCounter you will get information such as when, from where and by using what your visitors have visited your site.
LE fastcounter
It's fast, reliable counter. Receive stats updates via email. Choose from several different counter styles
ShowStat
Use for free if you get less than 10,000 hits per day
