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Statsignal - Statsignal is a simple and cost-effective way to monitor your website or server and publish a status page of your system.
socat - socat is a relay for bidirectional data transfer between two independent data channels.
OnlineOrNot - Uptime monitoring for software teams (even teams of one).
Komodia Relay - Free open source tool to perform TCP based session relay
Site monitoring - Free open-source website monitoring software, easy to set up and use for monitoring web sites.
Simple Port Forwarding - Simple Port Forwarding works with WebPages and not directly with your router.