PortPlay is described as 'Port forwarding service that lets you host game servers on your own PC and share them with friends — without a public IP address, without configuring your router, and without installing anything on your friends' machines' and is a Remote Desktop tool in the network & admin category. There are four alternatives to PortPlay for a variety of platforms, including Mac, Windows, Linux, Web-based and BSD apps. The best PortPlay alternative is tunnl.gg. It's not free, so if you're looking for a free alternative, you could try tunnl.gg or ngrok.
Securely expose local web servers online with instant public URLs, no installation, automatic HTTPS, SSH-based tunneling, random subdomains, and zero configuration, enabling fast, temporary access for development, testing, demos, and seamless integration.
ngrok exposes local servers behind NATs and firewalls to the public internet over secure tunnels.
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Port forwarding service for exposing your local PC to Internet from behind firewall or without real IP address. Uses OpenVPN or SSH encrypted tunnel from localhost to Portmap.io.
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