As a programmer most of my utilities are CLI oriented.

zsh
fzf (integrated into zsh, improves reverse search, killing processes and more)
zoxide - for quicker navigation into folders I visit often
Other programs I use from time to time: jq, btop, bat.

Flameshot - best screenshotting tool for linux (and also windows)
Redshift/Gammashift - blue light filter
ddccontrol - controlling monitor brightness and contrast without having to fiddle with buttons

Last but not least my Awesome WM (tiling) config - makes working with multiple windows/desktops so easy.