Uno Platform

Build Mobile, Desktop and WebAssembly apps with C# and XAML.

20 Alternatives To Uno Platform

Agar

Agar GUI

Avalonia

A multi-platform .NET UI framework

FLTK

Fast Light Toolkit - Fast Light Toolkit (FLTK)
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Fox toolkit

fox-toolkit.org
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IUP Portable User Interface

IUP is a multi-platform toolkit for building graphical user interfaces.

Ionic Framework

A front-end SDK to develop applications with HTML5 , CSS3 and JavaScript.

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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Nativator

Convert any web app to native mobile app fast & easy. Nativator.

NativeScript

Build truly native apps with JavaScript

PhoneGap

Easily create apps using the web technologies you know and love: HTML, CSS, and JavaScript.

PortAudio

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

PyGTK

PyGTK lets you to easily create programs with a graphical user interface using the Python…

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.
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React Native

A framework for building native apps with React

RtAudio

RtAudio is a set of C++ classes that provide a common API for realtime audio input/output across…
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wxSVG

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

wxWidgets

wxWidgets: Cross-Platform GUI Library