missive

Install command: 
brew install --cask missive

Name: Missive

Team inbox and chat tool

https://missiveapp.com/

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

Cask code: missive.rb on GitHub

Current version: 11.11.0

Requirements: macOS >= 10.13

Analytics:

Installs (30 days)
missive 5
Installs (90 days)
missive 27
Installs (365 days)
missive 94