NetMaker is another: https://www.netmaker.org/

Compared to Tailscale the main weak point of these clones seems to be ACLs. Tailscale's system is very robust and surprisingly simple. The others I've seen are less well developed. I'm sure they will get there in time, but for now Tailscale is definitely the best if you want to control access.

The recent ones I've seen are these:

* NetBird (https://netbird.io/)

* Firezone (https://www.firezone.dev/)

But none of them as advanced as Head/Tailscale though.

No support for exit nodes for example, or DNS hostnames.

I agree, but they will get there. They just looked more polished, but that's all at the moment.