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Thanks for making me feel like an idiot for not knowing things after age 30.
Gnu Guix. By default Guix uses only free libre software, but there are ways to install it with a non-free kernal. Systemcrafters has a guide (this is what I used) as well as non-guix (guix repo for non free software).
Helix is a modal text editor, but I haven't used it as much as I'd like because it lacks the plugins I use in Neovim.
I am surprised that no one mentions this.
Firefly III this is an amazing financial tracking and budgeting tool that literally saves me so much time and money, I even donate monthly since it's so good and essential to me that I think it's only fair that the developer gets something back.
A more private and secure messenger than WhatsApp, signal and telegram, like simplex
Along similar lines, I'd say Snikket. I feel XMPP often has quite a bad reputation based on the user experience from 10 years ago, but it's come such a long way and projects like Snikket make it very easy to get started.
MusicBrainz Picard
Amazing music tagger and batch renamer, for those of us who still have all our music as files.
xpra: it is like tmux but for X windows (works on wayland), but it can do much more than that. You can seamlessly run GUI programs from a container or VM on your main desktop while still sandboxing their X capabilities, forward windows from Windows desktops, and it has efficient encoding so it is usable over poor connections as well.
For 3D Modelling / Printing, if you have even a little bit of programming / scripting ability, OpenSCAD is amazing.
It's basically just a small scripting language for generating 3D objects and performing 3D modelling operations and its so handy to be able to store important info as precise variables, and create new objects and cuts and stuff just with for loops and if statements.
I use the web version a lot of the time, and while it could use a little work, it's pretty amazing.
More people should code Csound. Doesn't matter if you're musically inclined or not. Just do it. Make weird noises. Have fun!
Shutter encoder, it has a ton of useful tools built in for quick video conversion, compression, trimming, etc, and it works very well for batch encoding of a lot of different video files
Affine, its a surprisingly feature rich notes app (open source but all cloud features are currently paid)
KopiaUI, an easy to use automatic backup program
ViMusic, android APK to play music from youtube, Ive just come across it when I wanted to listen to some OST that were only on youtube and my phone by default doesn't let me play youtube and block the screen. Im not gonna pay any subscriptions ever.