I use Gnome as my main DE, so I use the Pop shell for automatic window tiling. It's not being actively maintained anymore while Pop works on their new DE, but it still works pretty great. I have my eye on Veshell which is an upcoming DE from the guy who made the Material Shell overhaul for Gnome. It's a significant change to the UX compared to any other DEs I've tried.

My main productivity work is making vector files for a laser cutter, so I use a combination of Inkscape and Lightburn (not FOSS) for that. I also use Openscad and Prusa Slicer for making various repair parts, but that's not usually paying work.

On the terminal side I prefer fish and kakoune. Kakoune's changes to the vim/neovim keybinds are a lot more intuitive and easier to learn imo, but come with the obvious downside of learning something less universally useful than the vim keybinds.