Like that time they made their own Powershell imitation of curl? (before deciding it was an abomination and finally including stock curl, but not removing the old Powershell commandlet because of backwards compatibility so now curl and curl.exe are two different things and you’ll want the latter)
Sort of. Headscale is an OSS component that replaces the SAAS Tailscale component but it’s not a full replacement. It’s still pretty dang good though.