In addition to the usual suspects of tmux, random window managers + friends, here are the applications I have to install to function
rofi - Fast, phenomenally good launcher
terminator - Terminal that allows splitting, tabbing, and more importantly bonding
redshift - Literally, shift my red light levels by time of day
retext - I write a lot of markdown. Seeing it real-time previewed makes life significantly better for me.
steam - A distraction now and then certainly helps