I install Chrome, Keepingyouawake, spectacle, f/Lux, littlesnitch, MSOffice, atom, iterm2, Xcode and a few others. Many are either done via homebrew or the App Store. Be cool to have a new thread for people's "must have" apps.
https://news.ycombinator.com/item?id=12555847
That said, Linux is looking more and more appealing every OSX release and with how much I use it already via docker containers, virtual machines and the like, that will probably be my next move if Apple continues removing power user features from OSX while letting software release quality continue it's decline. There are some amazing open source alternatives available for the vast majority of apps on that list that I've been testing for months now as I honestly don't believe Apple really wants to change to meet the needs of yesterdays power users anymore.