kdiff3

Install command: 
brew install --cask kdiff3

Name: KDiff3

Utility for comparing and merging files and directories

https://invent.kde.org/sdk/kdiff3

Cask JSON API: /api/cask/kdiff3.json

Cask code: kdiff3.rb on GitHub

Current version: 1.12.2

Current version requires: macOS >= 10.15

Versions:

Intel sequoia 1.12.2
sonoma 1.12.2
ventura 1.12.2
monterey 1.12.2
big sur 1.12.2
catalina 1.12.2

Analytics:

Installs (30 days)
kdiff3 515
Installs (90 days)
kdiff3 2,085
Installs (365 days)
kdiff3 7,506
Fork me on GitHub