For me, Google video search, Google books (Internet Archive is good, but doesn’t always have the same stuff), Adobe InDesign (but in the process of learning LaTeX), and Typewise. As for the Google stuff, I liked Whoogle a lot, but almost all their instances seem to have been blocked or shut down. Also, apologies if this is repeating an earlier post.
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.