Adobe After Effects. Despite being an unstable spaghetti code nightmare, there is no other viable option for professional motion graphics designers.
Free and Open Source Software
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
I want to jump to linux, but the prospect of starting from scratch on a new OS (or even a reinstall of windows) is just not feasible right now.
If I was the only person using my PC, I'd probably make the jump.
Unfortunately, my wife would end me if I tried that.
Onenote! I use it for school and work, and love the syncing capability and the flexibility in structuring and organizing my notes. I also like the keyboard shortcuts and the way it can dock to a side of the screen to keep the main content visible
Would https://anytype.io/ be a replacement? It's very new so you might not have heard of it. It's designed like Notion, but it might have everything you need.
If your needs are more simple, https://notesnook.com/ could be worth looking into.
Other FOSS options are Joplin and Logseq. I'm an Obsidian user myself; not FOSS but the storage format is completely open which is the most important to me.
Sublime text. It is just so fucking good! Much more performant than even nvim.
firmware/drivers
Pretty much anything on my phone. Though I have recently found f-droid, and through that I found Phonograph. I wish open street maps could replace google maps, but I really don't know what it's trying to do.
Depends on your country, but where I live Open Streetmap is better than Google's map. I hear OsmAnd is a great app, but I don't use a smartphone so I haven't tested it. I just know that their very compact offline maps are impressive.
Nvidia drivers. Back in 2019, I was looking to replace my Nvidia card with an AMD one, but decided I could put that off for a few months. Then COVID happened along with the cryptocurrency boom and prices skyrocketed to unreasonable levels. Nvidia drivers are honestly the last holdout on my machine barring perhaps some firmware somewhere.
Nationwide banking.
Intuit software, specifically TurboTax. This also may become obsolete to replace if the IRS will give out free software as rumored for next year, but I'm surprised nothing as intuitive ^pun ^heh or user-friendly has popped up. Maybe I need to do more research, not sure.
Discord and Windows. I have had so many bad experiences whenever I have tried Linux that I am extremely reluctant to give it another go despite all the improvements it has made.