I'm going to try to mention things I haven't seen already written, though I may repeat some of the more important ones to me.
(In no particular order)
Terminal:
- Kitty (Main Terminal)
- Fish (Terminal Prompt)
- Neovim (Code/Text editing)
- Zoxide (a directory changer; once you go to a directory, you can type z and a partial name to go back to it)
- Atuin (a command history lister, can get a key and bring over commands from other systems)
- Midnight Commander (CLI file manager)
- Btop (CLI system monitor)
- Palette (I do a lot of theming in different configs as well as HTML/CSS, so its nice to have something to quick convert hex to RGB).
GUI:
- Timeshift (backup/restore)
- Eddie (for AirVPN)
- novelWriter (my FAVORITE writing tool for my books)
- Floorp (Firefox fork browser)
- Conky Manager 2 (desktop monitoring widgets)
- Rofi (keyboard launcher)
- firewalld (tried this out recently, good firewall)
- Flameshot (ALWAYS; its my favorite screenshot tool)
- MPV (I still get VLC, but opt for MPV most of the time for videos/streaming)
- Speedcrunch (A+ calculator)
- Steam
- Lutris
- Protonup-QT (to inject GE Proton into Steam/Lutris)
- Stremio (a great little streaming tool)
I would like to add that I do use Arch, but I'm fairly sure 99% of these packages, if not all of them, are available for most other distros.
For CLI lovers: Check out Terminal Trove
Edit: I did see that someone mentioned no explanations on the apps, so I tried to put a little blurb on each.