One thing I find myself constantly checking on my personal machines is the amount of free space. macOS doesn’t provide a quick way to get that information without switching the context, that’s why I created DiskInfo.app, a truly simple application for the menu bar that displays some statistics. One click, get the job done. I use it all the time 😁. Unfortunately it isn’t available on the App Store anymore, 100€/year only for this small tool is way too expensive.
Source code available at https://github.com/dgellow/DiskInfo.