grandperspective

Install command: 
brew install --cask grandperspective

Name: GrandPerspective

Graphically shows disk usage within a file system

https://grandperspectiv.sourceforge.net/

Cask JSON API: /api/cask/grandperspective.json

Cask code: grandperspective.rb on GitHub

Current version: 3.6

Requirements: macOS >= 10.15

Versions:

Intel catalina 3.3

Analytics:

Installs (30 days)
grandperspective 801
Installs (90 days)
grandperspective 2,280
Installs (365 days)
grandperspective 7,515