Earlier quoted context omitted.
Microsoft's Xamarin Forms 3.0 (stable release later this year) allows you to target Linux and Mac[1] and is very similar to UWP conceptually - UI written once, run anywhere. It's just that Xamarin's "anywhere" is much larger :) Disclosure: I work on Xamarin team at Microsoft [1] https://forums.xamarin.com/discussion/85747/xamarin-forms-fe...
Question for you - I have created a few (okay, two) UWP apps, but the limited success of the store has made me look to using Xamarin. Only thing is, Xamarin's XAML is sufficiently different from UWP's XAML that I got disoriented and gave up. If I want to target cross platform apps (including Linux and Mac), should I wait for Xamarin Forms 3 or will UWP eventually expand to cover Mac & Linux? I'm only a hobby programm…
If you check BUILD 2017 sessions, there were a couple of talks about it.