ShoreTel - Cloud phone system & contact center software & services
Zabbix - Track, record, alert and visualize performance and availability of IT resources
CorvisaOne - CorvisaOne is another cloud-based communications suite that is specially designed for companies that need features for managing inbound or outbound call centres.
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.
SolarWinds Service Desk - An IT service management (ITSM) solution that understands what it takes to successfully manage your employee services. Try Solarwinds Service Desk for free!
Prometheus - An open-source systems monitoring and alerting toolkit.