Opbeat - Application monitoring for developers
ServerSuit - ServerSuit is a browser based program that enables remote Linux administration, monitoring, website hosting, and server setup automation.
AppDynamics - Get real-time insight from your apps using Application Performance Management—how they’re being used, how they’re performing, where they need help.
RedGate SQL Monitor - SQL Monitor helps you and your team find issues – before they become problems
Atatus - Full Stack Observability Platform
Nagios - Complete monitoring and alerting for servers, switches, applications, and services