unpkg

Install command: 
brew install --cask unpkg

Name: unpkg

Unarchiver for .pkg and .mpkg that unpacks all the files in a package

https://www.timdoug.com/unpkg/

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

Cask code: unpkg.rb on GitHub

Current version: 4.8

Requirements: macOS >= 10.15

Analytics:

Installs (30 days)
unpkg 17
Installs (90 days)
unpkg 45
Installs (365 days)
unpkg 265