Apache JMeter - Apache JMeter™.
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.
OctoPerf - OctoPerf is a SaaS load testing solution, based on JMeter.
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.
Loadrunner - Discover how HP performance, stress, and load testing software LoadRunner can prevent costly...
LogicMonitor - LogicMonitor is the SaaS performance monitoring platform for the world's best IT teams. Deploy Fast, Monitor More, Improve Ops.