redquits

Install command: 
brew install --cask redquits

Name: RedQuits

Quit an app when closing the last window

http://carsten-mielke.com/redquits.html

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

Cask code: redquits.rb on GitHub

Current version: 2.0

Requirements: macOS >= 10.11

Analytics:

Installs (30 days)
redquits 60
Installs (90 days)
redquits 145
Installs (365 days)
redquits 510