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.
SanityCheck - Get the exact data you need from Google Search Console.
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.
Website Speed Ranker - Compare how fast your website loads vs your competitors
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Smaller - Make your websites load faster