Zabbix - Track, record, alert and visualize performance and availability of IT resources
WebLOAD - WebLOAD - The most flexible and cost effective software for enterprise load, stress and performance testing, integrated with DevOps processes. Click for details
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.
Prometheus - An open-source systems monitoring and alerting toolkit.
SmartMeter.io - Performance Testing with Enterprise-Level Features with a familiar jMeter interface