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What non-FOSS software have you been unable to quit?
(beehaw.org)
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FolderSync on android. It's the only automatic sync application I've found that syncs to mydrive.ch.
Also a couple of UI apps, BarLauncher, which is a notification thing that let's you put app icons to launch from the notification drop down, and LaunchyWidget, like a scrolling "fence" to dump app icons in on your home screen. They're both so simple, I'm surprised that nobody has built FOSS versions of them.
On my PC I don't use any proprietary software at all.