Azure Network Watcher - Azure Network Watcher provides multiple features to help you visualize key parameters, track, troubleshoot, and activate or deactivate logs for resources in an Azure virtual network.
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 Network Bandwidth Analyzer - Download a 30-day free trial of Network Bandwidth Analyzer Pack, easy-to-use software that delivers real-time monitoring, alerting, and reporting for routers, switches, and other SNMP-enabled devices.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
SevOne - SevOne provides network managers with monitoring, troubleshooting, and performance reporting capabilities.
Better Uptime - We call you when your website goes down