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You might want to have a look at kronkhite if you are looking for a KDE Tiling-Window-Manager. I came from awesome-wm and never looked back.

Also check out Bismuth which is more advanced and really well integrated:

Krita, the drawing program, has been great (in limited experience).

Atril seems much faster than Okular.

Sway really is a disease, once you go into it, you cannot ever go back to a floating DE. It's just so fucking comfy