Zabbix - Track, record, alert and visualize performance and availability of IT resources
BeAnywhere Support Express - Get Live From the Cloud
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.
CID - Cloud-based Computer Diagnostic App
Prometheus - An open-source systems monitoring and alerting toolkit.
Monitis - Monitis specializes in IT monitoring, covering server, website, app monitoring and more within an all-in-one monitoring platform.