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Site24x7 offers both free & paid website monitoring services. Monitor websites remotely and receive instant email/sms alerts if your website becomes unavailable. View uptime & performance graphs of your website monitors.
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Complete monitoring and alerting for servers, switches, applications, and services.
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openITCOCKPIT is a leading open source monitoring framework based on Naemon (Nagios). In addition it integrates Checkmk and Prometheus. It also offers interfaces to Icinga2, PRTG and opManager to obtain status and performance from them.
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Kloudfuse is a unified observability platform that automates monitoring and troubleshooting across your entire modern tech stack from infrastructure to cloud services to applications. .