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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.
SmartSniff - SmartSniff is a packet sniffer that capture TCP/IP packets and display them as sequence of conversations between clients and servers.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
netcat - Netcat is a featured networking utility which reads and writes data across network connections...
Better Uptime - We call you when your website goes down
tcpdump - tcpdump is a common packet analyzer that runs under the command line.