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.
Qrvey - Embedded Analytics built exclusively for SaaS applications.
Prometheus - An open-source systems monitoring and alerting toolkit.
DevicePilot - DevicePilot is a universal cloud-based software service allowing you to easily locate, monitor and manage your connected devices at scale.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services
AnswerRocket - AnswerRocket is a search-powered analytics that makes it possible to get answers from business data by asking natural language questions.