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Microsoft donates the Mono Project to the Wine team
(www.gamingonlinux.com)
This is a most excellent place for technology news and articles.
It is the .net framework version. I'm not sure mono is used in anything but Xamarin and a handful of gnome apps. Xamarin has a clear upgrade path to MAUI but not without some effort and the risk of missing nugets, I did it on a small app once. This isn't super useful.