Cross-platform modern c++ GUI

Qt Base (Core, Gui, Widgets, Network, ...)

SDK for building cross-platform desktop apps in ANSI-C

NoesisGUI samples (C++, C#, Unity, Unreal)

Simple and Fast Multimedia Library

Embedded graphics library to create beautiful UIs for any MCU, MPU and display type.

Dear ImGui: Bloat-free Graphical User interface for C++ with minimal dependencies

✔️The smallest header-only GUI library(4 KLOC) for all platforms

Cross-Platform C++ GUI Library

JUCE is an open-source cross-platform C++ application framework for desktop and mobile applications, including VST, VST3, AU, AUv3, LV2 and AAX audio plug-ins.

Elements C++ GUI library

ImTui: Immediate Mode Text-based User Interface C++ Library

RmlUi - The HTML/CSS User Interface library evolved

Fast, flexible and simple GUI.

Cross-platform GPU-oriented C++ application/game framework

Skia-based C++ UI framework

Modern accelerated GUI

Simple and portable (but not inflexible) GUI library in C that uses the native GUI technologies of each platform it supports.

A single-header ANSI C immediate mode cross-platform GUI library

A simple and easy-to-use immediate-mode gui library

Abandoned: GWEN - GUI Without Extravagant Nonsense.

The Tk Widget Toolkit For Tcl (Mirror of core.tcl-lang.org)

Crazy Eddie's GUI library is a versatile, fast, adjustable, multi-platform, C++ library for creating graphical user interfaces for games and rendering applications

Our build of qt, which is based on Valve's build of qt

Lightweight JavaFX Framework for Kotlin

Build smaller, faster, and more secure desktop and mobile applications with a web frontend.

A cross-platform UI library written in V

Minimalistic GUI library for OpenGL

Qt based tool window manager

A data-first Rust-native UI design toolkit.