Free website statistics

AWStats (See a sample here)
AWStats is a powerful and featureful tool that generates advanced web statistics, graphically. AWStats show you the following information:

* Number of visits, and number of unique visitors,
* Visits duration and last visits,
* Authenticated users, and last authenticated visits,
* Days of week and rush hours (pages, hits, KB for each hour and day of week),
* Domains/countries of hosts visitors (pages, hits, KB, 269 domains/countries detected, GeoIp detection),
* Hosts list, last visits and unresolved IP addresses list,
* Most viewed, entry and exit pages,
* Files type,
* Web compression statistics (for mod_gzip or mod_deflate),
* OS used (pages, hits, KB for each OS, 35 OS detected),
* Browsers used (pages, hits, KB for each browser, each version (Web, Wap, Media browsers: 97 browsers, more than 450 if using browsers_phone.pm library file),
* Visits of robots (319 robots detected),
* Worms attacks (5 worm's families),
* Search engines, keyphrases and keywords used to find your site (The 115 most famous search engines are detected like yahoo, google, altavista, etc...),
* HTTP errors (Page Not Found with last referrer, ...),
* Other personalized reports based on url, url parameters, referer field for miscellanous/marketing purpose,
* Number of times your site is "added to favourites bookmarks".
* Screen size (need to add some HTML tags in index page).
* Ratio of Browsers with support of: Java, Flash, RealG2 reader, Quicktime reader, WMA reader, PDF reader (need to add some HTML tags in index page)