Recommended and mentioned products
Build Mobile, Desktop and WebAssembly apps with C# and XAML.
Uno - an alternative to Avalonia, but not as popular.
Create iOS, Android and Mac apps in C#
Xamarin - Basically an older version of MAUI. I would advise against creating new projects on Xamarin since MAUI is supposed to render it obsolete.
A multi-platform .NET UI framework
Avalonia- Basically a cross-platform version of WPF. Far more mature than MAUI and is very well-respected. (My personal recommendation).