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Until I get the nerve to write my own app. I have quite some small apps that I just wrote myself. Battery readers, volume managers, handlers for keypresses, cpufreq graphical interface, etc.
gqview isn't broken, so I won't break it myself. If I want something else, I'll code that, period.
That's a list of what I usually need when I setup a new Linux PC. Sure, I gradually add more stuff, but that, alone, should be more than enough and there are obviously things to remove from that list in many situations.
You know that you can have a POSIX subsystem in the Windows architecture, right? I'm no fan of how Windows is made, but I see a place in the world for this wonderful project. A FLOSS reimplementation of something is always well-received.
My opinion is as valid as yours ( I assume you've used both too, and that you don't have prejudice against any of them). I'm not saying I'm right, I'm saying I feel that GitHub is far superior -- for my needs.