Advanced Port Scanner - Advanced Port Scanner is a fast and free software for port scanning.
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.
WakeMeOnLan - Turn on computers on your local area network by sending Wake-on-LAN packets.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Wake On LAN Ex 2 - Free software from Joseph (AKA BootBlock) of http://www.bootblock.co.uk
Better Uptime - We call you when your website goes down