macforge

Install command: 
brew install --cask macforge

Name: MacForge

Plugin, App, and Theme store which includes plugin injection

https://www.macenhance.com/macforge

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

Cask code: macforge.rb on GitHub

Current version: 1.1.0

Requirements: macOS >= 10.13

Analytics:

Installs (30 days)
macforge 26
Installs (90 days)
macforge 75
Installs (365 days)
macforge 275