Steam. It is one of the few company's that still has principles
Free and Open Source Software
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Because they are not publicly traded, i hope it stays that way
Wanting to make money from your app doesn't prevent you from making it foss, therefore I have no favourite proprietary apps
I think you've got a bit of a misconception about FOSS software - you're allowed to make money selling it, you just also have to provide the source code to any customers! A fair few FOSS apps have free versions on F-Droid but paid versions on the Play store, for example.
Like what?
For example Red Hat Enterprise Linux. They're FOSS but they charge money for support.
My fave is Anki, free on Android and 25 USD on i0S for the exact same product.
Simple Mobile Tools (Simple Contacts etc.) cost money for the full version on Play but you can get it for free on F-Droid or GitHub!
Steam.
A linux client that works, and actually gets fixes, improvements, and features, that is a lot.
Davinci Resolve
Really good video editor, and also, has Linux client.
Davinci Resolve is mind bogglingly good video editing software and the free (beer) version is all 90% of people need.
Spotify is the only subscription I ever pay, even though I'm an avid pirate and I don't have any qualms about pirating music, I love the Spotify algorithm so much, it introduces me to new music all the time which is something I love
Obsidian. Silver Bullet is a FOSS alternative, but I’m not sure if they do toggles or something that works like it. And I really like my toggle-like functionality. I happily use callouts to simulate toggles in Obsidian.
Joplin is another FOSS alternative to Obsidian. I've been using it for years; it let's you encrypt your notes in place so they can't be read without the client having the password to access them.