.NET Multi-platform App UI (.NET MAUI) will allow developers to build apps for any device from a single code codebase and project system, including desktop and mobile devices across operating systems.
.NET MAUI is the evolution of Xamarin.Forms and will be expanded to provide both MVU and XAML programming models. It will be developed in the open on GitHub as part of the unified .NET in the .NET 6 time-frame with a preview available at the end of 2020.
Read more on the .NET team blog.
Contribute on GitHub.