Like Tailscale (wireguard, actually) but running over the Veilid network.
This repo contains the PDF book The Cyber Plumber's Handbook - The definitive guide to Secure Shell (SSH) tunneling, port redirection, and bending traffic like a boss. The book was first published in October 2018 for purchase, but now I'm providing it for FREE to anyone interested in learning more about the magic of SSH tunnels and port redirection.
Repo contains the PDF for download. CC-BY-NCv4
A reverse proxy and traffic tunnel to expose endpoints behind a firewall (say, on your laptop or devbox) to the outside world (a VM at a provider, let's say). Sets up a tunnel to the other machine over SSL/TLS. Supports websockets. Reconnects automatically. Implements authentication to keep people from poking around. Supports Let's Encrypt natively.
How to run FTP over an SSH tunnel to another server. It involves setting up a couple of port forwards and FTP in passive mode.