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Avalonia is not made by Microsoft and is often considered as one of the best way to make desktop app with .NET.

I can understand the confusion, Microsoft also has a framework called MAUI.

The Microsoft MAUI framework is the one being brought to Linux by Avalonia, yes.

The MAUI they are talking about is the Microsoft framework you are referencing.

MAUI is Open Source but Microsoft does not provide a Linux back-end. This is a non-Microsoft effort to bring Linux support to MAUI.