Nebula, from the Slack team, looks like a really solid solution. All nodes having their own certificate, it doesn't even require to trust the coordination server. I love it!
But I'm surprised I can't find any big company claiming to use it (other than Slack themselves). I can only find 'Home-labbers' and smaller businesses, but no big guys looking into it. At least not publicly. Has anyone seen it deployed in a bigger corporation?
I'm planning to replace the traditional network architecture in my homelab with it to practice Zero Trust.
Other than that, I mostly stopped using it because it forces you to regularly rotate all certificates, and for my personal purposes it was too much of a hassle.
I still like the project a lot and wish it would be more prominent. Nowadays everyone immediately seems to recommend Tailscale.