BuiltWith - Find out the technology behind websites
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Kompyte - Track & analyze competitors in real time.
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.
Vistaar - Vistaar is an innovator of price and revenue management solutions. Vistaar’s pricing software enables companies to achieve pricing best practices through price analytics, price optimization, price list management, and deal management.
Prometheus - An open-source systems monitoring and alerting toolkit.