mailplane

Install command: 
brew install --cask mailplane

Name: Mailplane

Gmail client

https://mailplaneapp.com/

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

Cask code: mailplane.rb on GitHub

Current version: 4.3.12,4954

Current version requires: macOS >= 10.12

mailplane 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)
mailplane 7
Installs (90 days)
mailplane 18
Installs (365 days)
mailplane 57
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