mp3tag

Install command: 
brew install --cask mp3tag

Name: Mp3tag

Tool for editing metadata of audio files including MP3, FLAC, OGG, and more

https://mp3tag.app/

Cask JSON API: /api/cask/mp3tag.json

Cask code: mp3tag.rb on GitHub

Current version: 1.9.6

Current version requires: macOS >= 10.14

Analytics:

Installs (30 days)
mp3tag 176
Installs (90 days)
mp3tag 507
Installs (365 days)
mp3tag 1,769
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