A New version of the Ninja Coder to support VS2015 is now available.
Version 3.7.0 now available
MvvmCross is a Mvvm cross platform framework using c# to allow development of solutions on Windows, Android and iOS.
Xamarin Forms is a cross plaform toolkit for creating User Interfaces from one set of XAML markup that work on iOS, Android and Windows Phone.
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See blog posts for more details