Clearbit - Clearbit provides Business Intelligence APIs
Zabbix - Track, record, alert and visualize performance and availability of IT resources
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
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.
InsideView - InsideView aggregates and curates all the company and contact data, news and social insights, and professional connections you need to do business better.
Prometheus - An open-source systems monitoring and alerting toolkit.