Avalonia UI
Uno Platform: Build Cross-Platform .NET Apps Fast with AI Visual & Designer
Uno Platform is the most complete cross-platform .NET UI framework for Web, Mobile, Desktop and Embedded. Boost productivity with Visual Designer, C# and XAML.
Qt Framework – Build Fast, Scalable Cross-Platform Software
Build complete cross-platform products with Qt Framework’s comprehensive set of libraries and APIs, flexibly combining powerful UI and core capabilities.
microsoft/microsoft-ui-xaml · GitHub
WinUI: a modern UI framework with a rich set of controls and styles to build dynamic and high-performing Windows applications. - microsoft/microsoft-ui-xaml