Zabbix - Track, record, alert and visualize performance and availability of IT resources
Parakeet - Cloud-based phone system with mobile app, designed for teams
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.
Convoso - Call center solution to covert leads faster
Prometheus - An open-source systems monitoring and alerting toolkit.
KronoDesk - KronoDesk is a web-based help desk solution.