Tailcat is a remix of Tailscale open source pieces to act like
netcat, but over Tailscale's data plane, without Tailscale's control
plane. Tailscale's data plane (magicsock, internally) gives you
point-to-point WireGuard-encrypted tunnels between two machines
with DERP as the NAT-hole-punching communication side channel and
the ultimate relay-of-last-resort if NAT traversal fails. Instead
of using the Tailscale control plane, all tailcat connection metadata
is exchanged out of band, however you want.
