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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.
netcat - Netcat is a featured networking utility which reads and writes data across network connections...
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
PortMapper - Do you need to map a specific TCP or UDP port on your machine to another port on another machine?
Better Uptime - We call you when your website goes down
Komodia Relay - Free open source tool to perform TCP based session relay