freefilesync

Install command: 
brew install --cask freefilesync

Name: FreeFileSync

Folder comparison and synchronization software

https://freefilesync.org/

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

Cask code: freefilesync.rb on GitHub

Current version: 14.4

Requirements: macOS >= 10.11

Analytics:

Installs (30 days)
freefilesync 174
Installs (90 days)
freefilesync 174
Installs (365 days)
freefilesync 175