For developers
Xcode, simulators, package managers and containers.
How to clear Xcode DerivedData, archives and simulators
Docker is eating my Mac's disk: how to reclaim it
Finding and deleting old node_modules folders
Cleaning up Homebrew, pip and other package caches
Understanding the du command (and why dux exists)
Rather see it than read it?
dux shows where your space goes in seconds. Free on the Mac App Store.