AWStats
AWStats (Advanced Web Statistics) displays information about who is accessing your website. The information is displayed in graphs and tables, and divided into monthly, daily, and hourly averages. AWStats also shows details about your visitors, including referers (sites visitors link from), HTTP error codes, and facts about your visitors, including their operating systems, browsers, and countries of origin.
To begin using AWStats, select the link corresponding to the domain you wish to view from the list on the main AWStats page. For more information about AWStats, please visit its website at http://awstats.sourceforge.net/.