AOMEI PXE Boot - Free AOMEI PXE Boot is one of the best PXE boot software which enables you to start up multiple client-side computers within LAN through the network from ISO image file on a server-side computer for system maintenance and optimization.
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.
Tiny PXE Server - Small portable standalone PXE server (dhcp+tftp+http)
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Serva 32/64 - Serva is an Automated PXE Server Solution Accelerator based on an all-in-one portable multi-server engine
Better Uptime - We call you when your website goes down