Tailcat: Tailscale Without Tailscale, by Tailscale
Summary
Tailcat is an open-source tool that lets you use the Tailscale data plane without the Tailscale control plane. It provides a Go package and CLI to run a server and client that communicate over a WireGuard-based data plane with DERP/NAT traversal, enabling netcat-like connectivity without accounts or a central control plane.