quail

Install command: 
brew install --cask quail

Name: Quail

Unofficial but officially accepted esa app

https://github.com/1000ch/quail

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

Cask code: quail.rb on GitHub

Current version: 2.4.0

Current version requires: macOS >= 10.11

quail is built for Intel macOS and so requires Rosetta 2 to be installed.
You can install Rosetta 2 with:
    softwareupdate --install-rosetta --agree-to-license
Note that it is very difficult to remove Rosetta 2 once it is installed.

Analytics:

Installs (30 days)
quail 2
Installs (90 days)
quail 6
Installs (365 days)
quail 17
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