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Graphical User Interface is a type of interface that has many graphics. Usually, it involves various metaphors, such as desktop or window. All modern consumer computers have GUIs, because it is thought people have little problems understanding them.
An exploration of Gnome's many failings and how to fix it.
Useless idea that makes sense.
Classic MacOS & GS/OS widget library for linux (and other?) - buserror/libmui
A collection of GUI screenshots.
On these pages you will find many screen shots of various desktop computer Graphical User Interfaces and operating systems. Many different people have had different ideas of how a GUI should work and these screen shots show many of the more popular ones.
Still maintained. A sweet collection. It's older than me.
The author doesn't like how modern UI:s are designed. Gives good examples.
Gio is an open source library for creating portable, immediate mode GUI programs for Android, iOS, Linux, Windows, macOS.