GoKawiilTailscale open-sources Tailcat, a lightweight peer-to-peer tunnel tool without accounts
Tailscale released Tailcat, a CLI and Go library that reuses pieces of Tailscale's data plane to create encrypted point-to-point connections like netcat, but without needing Tailscale's control plane or a user account. One machine runs a server and generates a short connection token, which the other side uses to connect; traffic is WireGuard-encrypted and initially routed through DERP relays before attempting a direct peer-to-peer upgrade via NAT traversal.