Gio is described as 'Library for writing cross-platform immediate mode GUI-s in Go. Gio supports all the major platforms: Linux, macOS, Windows, Android, iOS, FreeBSD, OpenBSD and WebAssembly' and is an app in the education & reference category. There are more than 10 alternatives to Gio for a variety of platforms, including Linux, Mac, Windows, BSD and Self-Hosted apps. The best Gio alternative is Qt, which is both free and Open Source. Other great apps like Gio are Electron, Flutter, GTK and wxWidgets.
The tkinter package (“Tk interface”) is the standard Python interface to the Tcl/Tk GUI toolkit. Both Tk and tkinter are available on most Unix platforms, including macOS, as well as on Windows systems.
The Fast, Light Toolkit (FLTK, pronounced fulltick) is a cross-platform graphical user interface (GUI) library developed by Bill Spitzak and others. Made to accommodate 3D graphics programming, it has an interface to OpenGL, but it is also suitable for general GUI programming.
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