What a nostalgic place the GUI gallery is:
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.
It's pretty fascinating to look at all of the permutations of these GUIS, starting with the very blocky Windows 1.0. There's a great example of online help in 1983 in this screenshot from VisiCorp Visi On.