Agar

Agar GUI

20 Alternatives To Agar

Avalonia

A multi-platform .NET UI framework

BeeWare

Write your apps in Python and release them on iOS, Android, Windows, MacOS, Linux, Web, and tvOS…
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Blender

Blender is the open source, cross platform suite of tools for 3D creation.

Chromely

Chromely is a lightweight alternative to Electron.NET, Electron for .NET/.NET Core developers.

Electron

Build cross platform desktop apps with web technologies

FLTK

Fast Light Toolkit - Fast Light Toolkit (FLTK)

Flutter by Google

Build beautiful native apps in record time 🚀
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Fox toolkit

fox-toolkit.org
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GTK

GTK+ is a multi-platform toolkit for creating graphical user interfaces.

JUCE

JUCE is a wide-ranging C++ class library for building rich cross-platform applications and plugins…
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JavaFX

JavaFX is the next step in the evolution of Java as a rich client platform.
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Material-UI

A CSS Framework and a Set of React Components that Implement Google’s Material Design

Nana C Library

Nana C++ Library - a modern C++ GUI library

PortAudio

PortAudio is a cross platform, open-source, audio I/O library.

PySide

Qt for Python - Qt Wiki

Qt

C++
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Qt Creator

Qt Creator is a cross-platform C++, JavaScript and QML integrated development environment. It is the fastest, easiest and most fun experience a C++ developer could wish for.

chaquopy

Python SDK for Android
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wxSVG

wxSVG is C++ library to create, manipulate and render SVG files.

wxWidgets

wxWidgets: Cross-Platform GUI Library