Stat counter is a free and invisible web tracker which displays and monitors web traffic to a website wither publicly or privately. It provides real time web stats by just adding a small code to the website. The stats can be shown to all or can be invisible. One single account in statcounter can give access to monitor and track the traffic to multiple sites. People can find out the most popular pages in the website, also the keywords through which site has been searched and browsed. - Stat Counter

404 Checker is a valuable resource for developers and internet users alike. 404 Checker has tools and information for visability and analysis of HTTP headers and HTTP status code information. Also guides to developing ways to enhance your user experience by customising error reporting. - HTTP Status Checker