duplicate-file-finder

Install command: 
brew install --cask duplicate-file-finder

Name: Duplicate File Finder

Find and remove unwanted duplicate files and folders

https://nektony.com/duplicate-finder-free

Cask JSON API: /api/cask/duplicate-file-finder.json

Cask code: duplicate-file-finder.rb on GitHub

Current version: 8.5,935

Requirements: macOS >= 10.13

Analytics:

Installs (30 days)
duplicate-file-finder 32
Installs (90 days)
duplicate-file-finder 81
Installs (365 days)
duplicate-file-finder 335