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
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.
SQL Sentry - SentryOne is the most capable, scalable software for data DevOps and database performance monitoring.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
NewRelic - New Relic is a Software Analytics company that makes sense of billions of metrics across millions of apps. We help the people who build modern software understand the stories their data is trying to tell them.