I like the Google Calculator, but don't use Google services and the Google Calculator can't work without Play Services for some reason. So I've tried all the popular open source ones and found https://github.com/sadellie/unitto to be the closest in experience (material design) and accuracy (the tan(355/226) test works). It also has conversions for other units, and even currency using https://github.com/fawazahmed0/exchange-api that is accurate enough for a rough estimate if you let it have Internet access.
Even if they made it Source Available it wouldn't hurt them much, because Minecraft is very easy to pirate and the reason anyone pays for anything at all is because you need an account in Mojang's authentication servers (which people do not want to move off of for various reasons).
Hell, they could even make it Open Source with a clause preventing other companies from using to code to make a profit. It's too big to fail.
It is much more complex than C, sure. But it's so much simpler than C++ and you won't find yourself digging through the reference, or standard, or whatever to understand the code you are writing. It's very close to the sweet spot of "not complex enough to make you bald, not simple enough to make your code complex" while also making correctness the default.
What I love about this is that it removes the need for anything suid completely, removing more Unix, thus making our systems more secure and overall better.
I'm actually working on my own OS agnostic package collection + system management software, and I've found https://radicle.xyz great for this. All repos depended on by the official package collection t will be on the radicle network.
This won't affect most users as they will be using the cache.nixos.org substituter and haven't modified any package that pulls repo.or.cz repositories, but it's still amusing.
There's no Virtual Terminal, aka TTY / VT, so the kernel is smaller and the insecure VT impl in the Kernel is not compiled in. In general, you get less moving parts and a more solid system.
The functionality of the VT as a fallback can be handled by cage+foot/whatever or kmscon.
You need to enable the option-key-as-alt config option (I recommend only doing it for left option) as alt and option aren't actually the same thing. The name of the config key may be different but it exists
Currently Linux and I think BSD, and the creator has said he wants to support MacOS and Windows, though those will only be included in the paid product.
On Linux and BSD, it supports Wayland and X11, though Wayland is better supported.
ie, Quickshell will forever stay completely free for free operating sysems.