ReactOS

Pros: I've no doubt they added a Windows XP-theme to it, but I'd like the ability to choose Interface colors such as Red, School-Bus Orange, Yellow, Lime, Green, Turquoise, Windows-XP Blue, Blue-Violet, Violet(not synonymous with Purple), Pink, Vintage-Beige, Chocolate Brown, Carbon-Fiber Black, Windows-XP Silver & Copy-Paper White to apply.

Cons: The Alpha-stage email updates!
Why don't more people with fatter wallets than mine pitch in so that ReactOS can reach Beta-stage already, it's already 2023 and I want a finished product THIS YEAR!

Overall: I can only take this open-source OS seriously once it has reached Beta-stage!
In the meantime, I'm quite safely running Windows 7 Professional 64-bit on my laptop and custom-built AMD-based PC!

Pros: Well, it's free, and the OS can run a lot of stuff, like the game Skyrim and Microsoft Office. I also managed to use it to print and to use photoshop.

Cons: It's hard to set up a workgroup or a domestic network, but take this with a grain of salt since it's a work in progress. ReactOS is a work in progress and it's at the level of Windows Vista, maybe windows 7 at best, but it will be a long time before it can be as responsive as windows 10/11.

Overall: Good, I even managed to use my GPU, and this is quite impressive for an alpha OS. But there is still a lot to be done, and you will face some issues with remote printing, unless you are and advanced user.