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Trayscale, a nice little GUI for Tailscale
(github.com)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
But you need to pay for a VPS to use Headscale behind NAT. If you're already paying for VPS it makes sense to use Headscale. But if you don't then you have to consider the price of a VPS vs Tailscale's free plan. Even if Tailscale eliminates that free plan, as long as they keep it around $4/mo they will still be a better option than a cheap VPS – assuming, again, that you don't have a VPS and the only reason you'd get one is for this purpose.
That's a complicated way to say:
Both comes at a cost, generally, but free options are available depending on your needs.