Also check out zerotier. I've been using it because it has a lot more features that tailscale (although it's been 4-5 years that I have the zerotier network set up).
Pretty damn useful to connect to services in my internal network wherever I go. I have it set up on my router, so I don't need to install it on every single server in the house :D
ZeroTier is definitely very good. I came very close to using it instead of Tailscale at work. One of the big reasons I didn't was I had asked sales a question about redundancy and they said "we've never gone down", so I quoted a tweet from them saying "Our control plane is coming back after the outage" and asked about it, and never got a reply.
I'm looking at setting up a VPN for my services at home and am considering ZeroTier or Nebula. Tailscale is out because I already have a tailnet and you can only have one (you have to switch networks if you have multiple).
I kind of regret not having used Nebula instead of Tailscale, because it gets rid of the control plane and it has less "magic" to it. Though Nebula seems to be moving much slower as far as improvements. I also checked out defined.net for nebula hosting, but at that time they were just starting to work on their API and I absolutely needed that because we have hosts that respin and join our net every night.
Pretty damn useful to connect to services in my internal network wherever I go. I have it set up on my router, so I don't need to install it on every single server in the house :D