Statsignal - Statsignal is a simple and cost-effective way to monitor your website or server and publish a status page of your system.
Scalefusion - Scalefusion is a Powerful Android, iOS, macOS & Windows 10 Device Management Solution for corporate-owned & employee-owned (BYOD) mobile, tablets, desktop & rugged devices.
OnlineOrNot - Uptime monitoring for software teams (even teams of one).
Jamf Pro - Jamf Pro is comprehensive enterprise management software for the Apple platform, simplifying IT management for Mac, iPad, iPhone and Apple TV.
Site monitoring - Free open-source website monitoring software, easy to set up and use for monitoring web sites.
ManageEngine Mobile Device Manager Plus - ManageEngine Mobile Device Manager Plus is an enterprise mobile device management solution that is designed to enhance employee productivity without compromising on corporate security.