XAML

AvaloniaAvaloniaUI/Avalonia

A cross-platform UI framework for .NET that builds desktop, mobile, embedded, and WebAssembly apps using C# and XAML.

MaterialDesignInXamlToolkitButchersBoy/MaterialDesignInXamlToolkit

A comprehensive Material Design theme and control library for WPF desktop applications in C# and VB.NET.

Uno Platformunoplatform/uno

Open-source platform for building single-codebase .NET applications that run natively on Web, Desktop, Mobile, and Embedded systems.

MahApps.MetroMahApps/MahApps.Metro

A toolkit for creating modern, Metro-style WPF applications with minimal effort.

WPFdotnet/wpf

A .NET UI framework for building modern Windows desktop applications with XAML and vector-based rendering.

Windows UI Librarymicrosoft/microsoft-ui-xaml

A modern UI framework with rich controls and Fluent Design for building high-performance Windows applications.

HandyControlHandyOrg/HandyControl

A collection of simple and commonly used WPF controls and styles for .NET desktop applications.

Xamarin.Formsxamarin/Xamarin.Forms

A cross-platform UI toolkit for building native iOS, Android, Windows, and macOS apps with C# and .NET.

Extended WPF Toolkit™xceedsoftware/wpftoolkit

A comprehensive collection of free WPF controls, components, and utilities for building modern Windows desktop applications.

Modern UI for WPF - MUIfirstfloorsoftware/mui

A set of controls and styles that transform WPF applications into modern-looking apps with customizable themes and navigation.

AdonisUIbenruehl/adonis-ui

A lightweight UI toolkit for WPF applications offering classic but enhanced Windows visuals with runtime theme switching.