Nagios - Complete monitoring and alerting for servers, switches, applications, and services
Netumo - Ensure healthy website performance, uptime, and free from vulnerabilities. Automatic checks for SSL Certificates, domains and monitor issues with your websites all from one console and get instant notifications on any issues.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
RedGate SQL Monitor - SQL Monitor helps you and your team find issues – before they become problems
AppZero - AppZero is a monitoring and migration tool that allows users to keep track of different applications and servers in both simple and complex IT environments.
Ekran System - Ekran System is an enterprise-grade user monitoring software.