monitorcontrol

Install command: 
brew install --cask monitorcontrol

Name: MonitorControl

Tool to control external monitor brightness & volume

https://github.com/MonitorControl/MonitorControl

/api/cask/monitorcontrol.json (JSON API)

Cask code on GitHub

Current version: 4.2.0

Requires: macOS >= 10.12

Analytics:

Installs (30 days)
monitorcontrol 2,738
Installs (90 days)
monitorcontrol 8,578
Installs (365 days)
monitorcontrol 22,178
Fork me on GitHub