There are many reliable statistics programs available, ranging from the most basic to a complete suite geared towards businesses. Below is a list of popular statistic programs that meet various needs.
Webalizer
It is one of the most basic of the statistic programs available, yet it could offer you all the information you need and is fully functional. Graphical and numerical data is displayed for monthly, daily, and hourly time spans. Additionally, you can keep track of your top referrers and the popular search terms that lead people to your site.
AWStats
AWStats is a step up from Webalizer and adds additional features coupled with a more professional interface. Some of these features include unique visitor tracking, improved search engine monitoring, visit duration, and more. AWStats is one of the best free statistics program available.
Google Analytics (formerly Urchin)
Google Analytics proves a comprehensive web analytic suite for those who need the most detailed information about web site traffic and visitor behavior. If has been released for free by Google (although currently you may have to wait whilst they scale up to meet demand) and requires you to include a small piece of code in each of your pages in order to track them. Analytics integrates with Adwords, for those people using the Google advertising program to give detailed ROI (return on investment) information.
