Qt is described as 'Cross-platform application framework that is widely used for developing application software that can be run on various software and hardware platforms with little or no change in the underlying codebase, while having the power and speed of native applications' and is a very popular software framework in the development category. There are more than 50 alternatives to Qt for a variety of platforms, including Windows, Linux, Mac, Android and Self-Hosted apps. The best Qt alternative is GTK, which is both free and Open Source. Other great apps like Qt are Flutter, Electron, React and React Native.
Avalonia is a WPF-inspired cross-platform XAML-based UI framework providing a flexible styling system and supporting a wide range of platforms including: Windows, Linux (desktop & embedded), macOS, Android, iOS and Browser.
The Qt for Python project aims to provide a complete port of the PySide module to Qt.
Ultimate++, also called U++, is a C++ cross-platform rapid application development framework focused on programmers productivity. It includes a set of libraries (GUI, SQL, etc..), and an integrated development environment.
GUI toolkit for Rust, C++, and JavaScript to efficiently develop fluid graphical user interfaces for embedded devices and desktop applications.
NativeScript lets you develop truly native apps for iOS and Android from a single code base of JavaScript or TypeScript, XML and CSS. NativeScript takes your cross-platform code and translates it into the language that your target platform speaks.
Felgo is a Cross-Platform Development SDK based on the popular Qt framework. Felgo Apps and Games are created within the Qt Creator.
One codebase, every platform. Dioxus is a React-inspired library for Rust focused on developer experience. Build fast, beautiful, and fully-featured apps for every platform in less time.
Appcelerator Titanium, offered for free by Appcelerator, lets web developers use web technologies, open source and cloud computing to build native apps for iPhone, Android, Windows, Mac OSX and Linux.
HARFANG®3D is a cross-platform & multi-language solution to integrate with embedded systems, existing environments & combining features to meet the industrial standards of 3D imaging.
CopperSpice is a set of individual libraries which can be used to develop cross platform software applications in C++. It is a totally open source project released under the LGPL V2.1 license and was initially derived from the Qt framework.
Uno is the platform for building native mobile, desktop and WebAssembly apps with C#, XAML from single codebase. It's a Universal Windows Platform Bridge that allows UWP-based code (C# and XAML) to run on iOS, Android, and WebAssembly.
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not well maintained, the documentation that says to be for version v11 is the same as for version 10, and the actual packages are completely different. NOT RECOMMENDED