jettison

Install command: 
brew install --cask jettison

Names: Jettison, St. Clair Software Jettison

Automatically ejects external drives

https://stclairsoft.com/Jettison/

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

Cask code: jettison.rb on GitHub

Current version: 1.9.4

Requirements: macOS >= 10.15

Analytics:

Installs (30 days)
jettison 21
Installs (90 days)
jettison 65
Installs (365 days)
jettison 259