OnlineOrNot - Uptime monitoring for software teams (even teams of one).
cutestat - Website Stats and Valuation. CuteStat.
Statsignal - Statsignal is a simple and cost-effective way to monitor your website or server and publish a status page of your system.
WebsiteOutlook - WebsiteOutlook is an all-in-one website that provides you detailed information on famous websites based on various data sources like traffic, page rank, and estimated ad revenue.
Uptime Kuma - A fancy self-hosted monitoring tool.
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.