Apache is a free and open-source cross-platform web server software.
Clicky is web an analytics tool which helps you to get real-time analysis including spy view.
Google Analytics is a free web analytics service that tracks and reports website traffic.
Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.
Histats is a simple website visitor analysis and tracking tool.