ReaLTaiizor is a .NET WinForms control library that offers a wide range of components and is user-friendly and design-focused.

Open source Motion/Tweening Tool/Library with Visual Editor with code or no code and easy drag and drop support for Unity Engine

📚 Windows Forms Control class library for "Quick" apps (.NET Framework)

User-friendly .NET visuals library designed for console apps

Clean, beautifully-designed, and customizable components for Avalonia applications.

Extension Methods to better build UI through code using Unity UIElements

Wpf pixel art ui library

The official Hedin UI library – Blazor components, themes, and extensions built on MudBlazor.

Supports Themes for WinForms user interfaces

Custom .NET WinForms controls that provide more styling options than the default controls

The FREE WinForms UI Library ∙ Stretch WinForms to its modern glory!

MiniUI is a reusable UI library for Unity built on top of the Unity UI Toolkit, which allows for a component based UI archetecture, a reference-less routing solution to streamline development and reduce errors, and an analogue to Tailwind CSS to for rapid prototyping.

A lightweight and flexible animation toolkit for Unity UI and visual effects

A custom UI-manager, allowing for opening and handling UI screens and components.

A lightweight UI enhancement library for Windows Forms applications. fuilib (Furkan's UI Library) provides modern window effects, visual improvements, and easy-to-use components for creating polished desktop interfaces.