self-hosted open source alternative Headscale/Headplane. Uses the Tailscale client without their SaaS being involved.
Headscale turns the $5 VPS into the thing that connects my laptop to my other compute resources while I am out and about.
For example, you can create a token that grants VPN access with inbound SSH as the only allowed traffic. Add that as a secret to GitHub Actions and now you can ad-hoc debug failing CI via `tailscale ssh`.