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.
ControlUp - ControlUp is a computer management & monitoring platform for managing Windows servers, workstations and user sessions.
UptimeRobot - Free Website Uptime Monitoring
SysKit Monitor - Meet SysKit Monitor, a powerful tool for server, app and user monitoring on Remote Desktop Services, Citrix XenApp or Windows Servers
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.
Systrack - Digital experience monitoring solution for IT