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GLUT (in the form of freeglut [1]) still exists (last commit is from February) and works on all major (desktop) operating systems. GLFW [2] is however much more wildly used these days and pretty much the spiritual successor of GLUT. ImGUI can run on top off all of them and doesn't provide the features (window/context creation, event handling) they do.

[1] http://freeglut.sourceforge.net/ [2] https://www.glfw.org/

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I still use freeglut and am mostly happy with it. Yet, I'm often mocked by my colleagues for that reason. I tried GLFW but I don't see the point of this library whose main raison d'être seems to be "not be freeglut" while having nearly identical features. Besides, the fact that it works with keycodes and not with letters is a bit annoying. The X server sends the key symbols but GLFW choses to ignore them, forcing the user to find them according to the current, difficult to find, keyboard configuration.

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