Well, the permanently open applications on my system are: claws-mail, Pale Moon (browser forked from Firefox), konqueror (TDE file manager), konsole (TDE terminal), and Aqualung (music player). Other good friends include kate, Inkscape, and OpenSCAD (despite its flakiness). And I get a lot of mileage out of DOSBox.

If the OP hadn't specified desktop software, I'd also name Portage.

Telegram Desktop is pretty good.

Pinta. It's like paint.net but works on Linux. Quick and simple way to edit images on Linux.

Thanks for the recommendation, I installed Flameshot on Windows and it's quite a bit better than the built-in tool.

Apostrophe. The perfect, slick markdown editor.

urxtv

Kubernetes, Docker and mpv.

Komikku

Probably emacs, or wine along with dxvk

I both installed kwrite and kate... whats the huge difference there? That one is more code focused and has git implementstion but still the same?

I just use the one built into gnome, it's the best one I've found yet having come from lightshot on windows, it just works exactly how I'd expect it to and doesn't get in my way

As for my favourite think it's gotta be either obsidian or Vscode/ium