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.
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.
Instrumental - Real-Time Application & Performance Monitoring
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Stackify - Stackify is the only developers-friendly solution that integrates error and log management with application performance monitoring. Code more support less. Start your free trial now
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.