eqmac

Install command: 
brew install --cask eqmac

Name: eqMac

System-wide audio equaliser

https://eqmac.app/

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

Cask code: eqmac.rb on GitHub

Current version: 1.8.12

Requirements: macOS >= 10.15

Analytics:

Installs (30 days)
eqmac 360
Installs (90 days)
eqmac 1,017
Installs (365 days)
eqmac 3,410