Calcium.Extras (nuget): Calcium Extras includes a User Options system, Form Input Validation, an Undo/Redo Task system, application State Preservation, and various cross-platform launchers for sharing links, sending emails and so forth.   This package includes all supported platforms: UWP, WPF, Xamarin Android/iOS.  Calcium is a zero-dependency cross-platform MVVM framework for creating UWP, WPF, and Xamarin applications. It provides much of what you need to rapidly create sophisticated yet maintainable applications.
Keywords: mvvm|xamarin|mvvmcross|mvvmlight|caliburn|android|uwp|ios|xaml