6. WPF
Xamarin.Mac
Gtk#
UI library
w/Eto.Forms
Core
Business logic
Xamarin.iOS
Xamarin.Android
Xaml
As you like System
Eto.Forms
Eto.Forms
System
Eto.Forms
Eto.Platform
WIP
A cross platform desktop/mobile user interface framework
by Curtis Wensley, Vivek Jhaveri - BSD like license