I'm much more comfortable with Linux and tools now, so I guess I'll update my list.
os: Arch Linux
wm: XFCE on desktop, dwm on laptop
music and video: mpv
file manager: coreutils + thunar (if i need drag+drop)
irc client: irssi
terminal emulator: xfce4-terminal/alacritty
shell: zsh
editor: emacs (converted from vim (sorry))
pdf viewer: zathura
screenshot: xfce-screenshot/scrot
image viewer: sxiv
mail client: thunderbird
compositor: picom
web: ungoogled-chromium

Overall, emacs has replaced a lot of my programming tools. In a way, this is nice because I get a more cohesive experience, but I do recognize the fact that it is less UNIX-y.