GrandPerspective
GrandPerspective is a small utility application for macOS that graphically shows the disk usage within a file system.
It can help you to manage your disk, as you can easily spot which files and folders take up the most space.
It uses a so called tree map for visualisation. Each file is shown as a rectangle with an area proportional to the file's size.
Files in the same folder appear together, but their placement is otherwise arbitrary.
https://grandperspectiv.sourceforge.net/