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Avalonia - A multi-platform .NET UI framework
wxWidgets - wxWidgets: Cross-Platform GUI Library
GTK - GTK+ is a multi-platform toolkit for creating graphical user interfaces.
JavaFX - JavaFX is the next step in the evolution of Java as a rich client platform.
Electron - Build cross platform desktop apps with web technologies
Uno Platform - Build Mobile, Desktop and WebAssembly apps with C# and XAML.