gStats is an open source web statistics program capable of running on any server supporting PHP and an ADOdb compatible database*. gStats is intended to provide as much information as possible about your visitors and the pages they view on your site. On top of that, gStats provides a high level of customizability and has been designed so that third party developers can easily drop in custom reports.

• Absolutely free, under GNU General Public License.
• Over 35 reports, including detailed reports on page hits, referrers, search engines, keywords, browsers, and more.
• View reports over any time range.
• Customizable report groups for logically grouping reports.
• Web configuration, no need to manually edit files or databases.
• Simple browser-based installation.
• Fully W3C HTML 4.01 and CSS2 compliant.