AWStats

AWStats (Advanced Web Statistics) is a free tool that generates advanced graphical web statistics. This server logfile analyzer works as a CGI or from command line. It uses a partial information file to be able to process large log files, often and quickly and can analyze all wbe/proxy/wap servers log files (Apache, IIS, Squid, Webstar). Features: Number of visits, and Unique visitos, Most often viewed pages, Domains/countries of hosts visitors, Rush hours, Browsers used, OS used, VISITS OF ROBOTS, Search engines and Keywords used to find your site, HTTP errors, Supports several languages, and more.