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DareBoost - DareBoost is an online tool to test, analyze and monitor your website: speed, SEO, quality, security. All you need for website optimization in a single service.
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.
TestWebsitePerformance.com - Perform website speed and usability performance reports.
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.
PageSpeed Insights - PageSpeed is addon for ...
Zabbix - Track, record, alert and visualize performance and availability of IT resources