Obsidian. Plain text files with as many or as few plugins as you want. All versions of the app look and behave the same (other than mobile, but at least android is kinda close). Nothing stored in a database file, no manipulation of the text files themselves (looking at you, Joplin). I'm open to another option but so far, nothing is as elegant and platform agnostic as Obsidian.
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I feel LaTeX is not a replacement for inDesign. It would be a replacement for something like word. maybe try scribus?
makemkv also basically most of my music software
Discord, Steam and Obsidian.
I'm really liking Logseq. I started on it instead of Obsidian since Logseq is FOSS. I understand it's not too hard to switch over since they both use markdown files, granted some scripts need to be run to convert markdown differences between the two.
Logseq's business model is to charge $5/mo for syncing on their (fully encrypted with a private key) server, but you can use a FOSS syncing solution (or a property one) if you prefer. I pay to support the project and to simplify sync on work devices I don't have administrator rights on (so most other sync solutions wouldn't work well.)
I started on it instead of Obsidian
This is the way. I started on Obsidian, and Logseq is painful in comparison. It's a good product, but I got accustomed to too many nice conveniences over the past couple of years.
I love logseq conceptually but constantly use org-roam because logseq is prone to performance breakdowns on my hardware
I tried Logseq, but it was slower than Obsidian and it's section/block oriented and I want it to be note oriented (Obsidian). It is a decent alternative tho.
Zettlr is trying, it's really trying, but it has less than half the features
Discord. As a chat platform, it is by far the most user-friendly one out there despite its proprietary nature and lack of respect for privacy.
Messaging platforms are so hard to replace since there's a social traction aspect. I can pick out the most secure and private messaging service, and then have no one to message on it
Clip Studio Paint IIt was way ahead than any commercial or FOSS alternative. Especially if you're illustrator or comic artist working in specialized workflow (East Asia and SEA industry).
Tried Krita back then, but still lacks a lot of major important feature and customizable UI layout.
chrome, the android os and platform and all the apps therein. I mainly use firefox, but some things only work in chrome.
Steam
Spotify and games
I also run a lot of proprietary stuff like Discord or Instagram due to peer pressure but I let it slide and put my hopes on Android sandboxing the apps and GrapheneOS tweaks. In my opinion, making sure that proprietary app can't reliably access your data and never giving it anything sensitive yourself is a decent risk model.
The only proprietary software I use and somewhat trust is Obdisian. Honestly, it's just excellent and I can't see myself moving away from it anytime soon.