Zabbix - Track, record, alert and visualize performance and availability of IT resources
SanityCheck - Get the exact data you need from Google Search Console.
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.
Website Speed Ranker - Compare how fast your website loads vs your competitors
Prometheus - An open-source systems monitoring and alerting toolkit.
Dareboost: Website Speed Comparison - Check how fast your website is against your competitors