XAML Islands enable .NET and native Win32 applications to host UWP XAML controls. You can enhance the experience and functionality of your existing desktop applications with the latest UI innovations previously only available for UWP apps.  

Grial UI Kit provides XAML templates, custom controls, helpers and resources that accelerate the creation of Xamarin.Forms apps. We make it dead simple for .NET developers to build beautiful cross-platform apps, fast.

Missing Silverlight and Waiting for Blazor? CSHTML5 for C# Web Development Goes Open Source 

I want to show you how easy it is to get a simple website up and running using Ooui  that is powered by Xamarin.Forms

At Microsoft Build Live today, we are sharing a first look at our plans for .NET Core 3. The highlight of .NET Core 3 is support for Windows desktop applications, specifically Windows Forms, Windows Presentation Framework (WPF), and UWP XAML. You will be able to run new and existing Windows desktop applications on .NET Core and enjoy all the benefits that .NET Core has to offer. 

Is WinForms Dead? 

Ammy is a modern UI language that either replaces or compliments XAML in your projects. 

XAML – Tips and Tricks