cindertunnel bridges a real local TCP port on your machine to a friend's, over a WebRTC DataChannel opened via cinder-mediated signaling. One side hosts, the other joins — no port forwarding, no account, and no cloud relay sitting in the middle holding your traffic once the connection is made.
Both sides run the same small native binary. Pair automatically (each side generates a one-time key and derives the same secret between you — see cindertransfer's own explanation of the pattern) or type a shared secret by hand. Once paired, one side hosts a local server and the other gets a new local port that bridges straight to it.
Unlike everything else in this family, cindertunnel has no server-side presence at all — it's a tool you run, not a site you visit. There's nothing to link to except the download itself.
In the pipeline — downloads aren't published yet. Check back soon.