Steam. It is one of the few company's that still has principles

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.

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.

I believe if the developer wants to make money from their apps, there’s noting wrong with it, as long as they are ethical.

Nothing wrong with making money from FOSS apps, even Richard Stallman wouldn't have a problem with that.

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

Reaper is an excellent Digital Audio Workstation with full Linux support

I guess foobar2000 is non-foss as it's free but not open source.

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.

Steam and Discord. They are the only non-foss apps that I use basically every single day. I'm trying to wean myself off Discord specifically, but I have so many communities on there that aren't on FOSS alternatives, and the FOSS alternatives like Matrix chat and such just don't cut it for me yet.

Plus literally all my friends I game with and chat with are on Discord and almost none of them are even slightly interested in migrating anywhere else.

Obsidian for my journaling and note-taking needs, The Storygraph for tracking my reading.

I’m happy with Affinity Photo as a cheaper, non-subscription Photoshop clone.

Never managed with GIMP :(

Scrivener is still the absolute best word processor for ginormous writing projects. There are FOSS projects that do some parts of it right, but fall far behind in the others. It's particularly frustrating because my usual FOSS approach would be to use other tools that make up for the inadequacies, but Scrivener pretty much nails the "what to include and what to leave out" equation. It's a great combo of a word processor, project management tool and a research/notes tool, all rolled into one.

Wanting to make money from your app doesn't prevent you from making it foss, therefore I have no favourite proprietary apps

Davinci Resolve is mind bogglingly good video editing software and the free (beer) version is all 90% of people need.

Sublime Text!

Unreal. It's one of the best game engines out there. It's extremely powerful and 5% of your profits over 1 million dollars is essentially giving it away.

People have mentioned most of the good ones (Scrivener, Resolve, Steam, Discord), but I must grudgingly nod to OneNote.

There are competitors in the note-taking space, yes, but none of them get handwriting down like OneNote has for 15+ years, now.

Autodesk Fusion 360. There's just not really a free competitor imo when it comes to CAD/CAM software, it's all Fusion or Solidworks.

Renoise is an excellent tracker-based DAW with Linux support (you still have to find Linux-compatible VSTs though). It changed the way I write music.

EDIT: I know there are FOSS trackers like MilkyTracker. If you want an alternative, I can recommend it, even though it doesn't offer the same amount of features as Renoise (e.g. VST or effect support).

• Sesame Shortcuts. I know there are launcher with similar tools included, but I also use Nova Launcher and paid for it. I've been thinking to migrate to alternatives, but I haven't done it yet.
• Microsoft To Do. The alternatives are incomplete, ugly or don't have the same capabilities. I'd gladly pay for any FOSS and Privacy respectful To Do app, but I guess setting up sync servers may be hard. I'll give a try for tasks.org again in some days.

I'm glad I don't get to say Notion anymore, Anytype.io is missing some features, but I can manage to live without them and Notion was getting worse with time.

Workflowy and Teuxdeux are two web apps where I spend an embarrassingly large amount of my time online. I wish there were FOSS alternatives because I would happily contribute features and fixes to the issues I bump into in my daily usage.

I'm going to take "favourite" at face value, i.e. that I actually like, not just that I am forced to use because the alternative doesn't exist (e.g. my bank's app or the post-office's app) or isn't viable (PDF editors on Android).

Libby, the lending library app. I could avoid it and stick to physical media and piracy, but it's a well-designed app with a decent catalogue and given that it's a library and not me purchasing DRMed files, I found the ethical proposition there tolerable.

JetBrains Rider

On Android, Google Maps, Google Docs et al., Snapchat and the various plant identication apps.

Garmin GPS appliance. I refuse to use Google anything, and the other options do not work on GrapheneOS when interfacing with my car. So I bit the bullet and got a Garmin

I really love PowerPoint. I feel like the automatic snapping features and general polish allow me to make very pretty slides with a high level of control, and it feels way better to use than e.g. web-based alternatives. Admittedly, I haven't tried a foss alternative in years.