Freshstatus enables businesses to communicate incidents, maintenances and status updates - 1-Click and easy - 250 subscribers in the free plan - Unlimited incidents, maintenance and automation
Ping is a beautiful Linux monitor app, it supports linux-based systems too.
It allows you track your Linux servers' status easily. You only need to add your Linux servers to Ping using SSH account and Ping will show metrics.
No dependency required, no deamon required.
Real-time Exception Monitoring and Alerting