What are some alternatives?
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Nagios - Complete monitoring and alerting for servers, switches, applications, and services
Sensu - Monitor servers, services, application health, and business KPIs. Get notified about failures before your users do. Collect and analyze custom metrics. Give your business the competitive advantage it deserves.
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.
BizTalk360 - BizTalk360 is a web based production support/monitoring tool for Microsoft BizTalk Server.
Graphite - Graphite is a highly scalable real-time graphing system.