udig

Public-key addressed TCP tunnel broker that exposes local services behind NAT with no signup

PlatformWebfree

udig is an open-source TCP tunnel tool that exposes a local network service behind NAT or a firewall through a public, stable ingress address, addressed by public key. Unlike commercial alternatives such as ngrok, it requires no account signup, making it suitable for automated use. It is aimed at developers who need to reach local services from the internet.

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