cutestat - Website Stats and Valuation. CuteStat.
OnlineOrNot - Uptime monitoring for software teams (even teams of one).
Rankchart - Rankchart is one of the unique websites that allows you to examine your websites or watch competitors and locate rich information about website technologies, site reputation, errors, SEO, and ad-word recommendations.
Statsignal - Statsignal is a simple and cost-effective way to monitor your website or server and publish a status page of your system.
Site Worth traffic - Site Worth traffic is a cost-effective site that is introduced to estimate the value, daily page views, daily visitors, and daily revenue of a website.
Uptime Kuma - A fancy self-hosted monitoring tool.