Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
Parakeet - Cloud-based phone system with mobile app, designed for teams
UptimeRobot - Free Website Uptime Monitoring
Convoso - Call center solution to covert leads faster
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.
KronoDesk - KronoDesk is a web-based help desk solution.