I always see interesting stuff when updating Homebrew, much of which I have no idea what it is:

$ brew update
==> Updated Formulae
==> allure      frugal   jenkins-lts  paket
==> bro         geth     jvgrep       plank  
==> chronograf  iperf3   mariadb      suricata
==> ffmpeg@2.8  jenkins  mpv          

$ brew info bro
==> bro: stable 2.5.3 (bottled), HEAD
==> Network security monitor

$ brew info suricata
suricata: stable 4.0.4 (bottled)
Network IDS, IPS, and security monitoring engine

Whoa, by sheer chance I picked two that were network security monitors.