Using MVVM in your Xamarin.Forms app  

Rider is a cross-platform .NET IDE: you can use it on Windows, Mac and Linux. Rider lets you develop ASP.NET, .NET Core, .NET Framework, Xamarin and Unity applications. 

- Unity/MonoGame
- GTK#
- Windows Forms
- WPF/Avalonia
- Xamarin.Forms
- xwt/Eto.Forms 

Learn Web API Using WPF, WebForms And Xamarin 

If you haven’t tried Xamarin yet, now is the time! Read this free white paper from Syncfusion to learn how Xamarin can improve your cross-platform development:

• Deliver apps faster by sharing code across platforms, using one code base and UI.
• Use best-in-class development tools, like Visual Studio.
• Produce genuine native apps that don’t compromise the end user experience.
• And more! 

Architecture Guidance
Common application patterns with .NET
Practical advice, best practices, and sample applications to help you implement different application patterns using .NET

Introduction Xamarin 

800+ Free controls and frameworks for .NET (Windows Forms, WPF, ASP.NET MVC, ASP.NET Web Forms, LightSwitch, Silverlight, Windows Phone, WinRT, Windows 8), iOS, Android, Xamarin and JavaScript platforms 

A $15,960 value for FREE