Open source
Avalonia UI
Cross-platform .NET UI framework with one XAML codebase
FrameworksCross-platform .NET UI toolkit
12 tools like Kivy, chosen by what they do. About Kivy

Cross-platform .NET UI framework with one XAML codebase

Build native desktop and mobile apps from one C# codebase





Free framework for iOS, Android and desktop-style apps





Progressive JavaScript framework for building web user interfaces