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.
SolarWinds NPM - Advanced network monitoring for on-premises, hybrid, and cloud. Download a FREE 30-day trial of SolarWinds Network Performance Monitor (NPM) today!
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Microsoft System Center - Microsoft System Center provides solutions to simplify the deployment, configuration, management, and monitoring of the infrastructure.
Better Uptime - We call you when your website goes down
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.