Apps similar to Magnum.engine include Qt, which is open source with a free version. Other options are GTK, Uno Platform, JUCE and Nevron Open Vision for .NET. In total there are five Software Frameworks like Magnum.engine for Mac, Windows, Linux, the web and Android.
Qt is a 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.
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GTK is a multi-platform toolkit for creating graphical user interfaces. Offering a complete set of widgets, GTK is suitable for projects ranging from small one-off tools to complete application suites.
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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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JUCE is a wide-ranging C++ class library for building rich cross-platform applications and plugins for all the major operating systems.
Nevron Open Vision for .NET is a suite of advanced UI components that helps you develop feature-rich Web (Blazor WebAssenbly) and Desktop (WinForms, WPF, Xamarin.Mac) applications from a single code base.
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