Avalonia

A multi-platform .NET UI framework

21 Alternatives To Avalonia

Agar

Agar GUI
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Bootstrap

Simple and flexible HTML, CSS, and JS for popular UI components and interactions

Electron

Build cross platform desktop apps with web technologies

FLTK

Fast Light Toolkit - Fast Light Toolkit (FLTK)
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Foundation

The most advanced responsive front-end framework in the world
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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.

Material Design

Google Material Design
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Material-UI

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

Polymer

Polymer is a library that uses the latest web technologies to let you create custom HTML elements.

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.

Semantic UI

A UI Component library implemented using a set of specifications designed around natural language
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UIKit

A lightweight and modular front-end framework for developing fast and powerful web interfaces
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Vuetify

Material Component Framework for VueJS 2

wxWidgets

wxWidgets: Cross-Platform GUI Library