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WinUI is the standard controls library for UWP

I'm not sure what WinUI is. It only seems to contain extra UWP controls. None of the primitive ones.

All new controls get added to WinUI. I believe the older controls will get moved to WinUI over time.

I work at Microsoft and use WinUI but don't directly work on it other than reporting bugs :)

I'm afraid UWP isn't open source.

In the meantime, Uno is the closest thing we have:

They can't open-source UWP because it's basically a Windows thing.

It's based on WinRT, which is based on COM.

They could still open source it.

It would be mich easier to port it if the source code was available.

You can open source Windows only code. Why not? WPF won't be cross platform either when open sourced.

UWP is WinRT (Windows Runtime). And, you're right, it's COM, but The Good Parts™.