mqttx

Install command: 
brew install --cask mqttx

Name: MQTTX

Cross-platform MQTT 5.0 Desktop Client

https://mqttx.app/

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

Cask code: mqttx.rb on GitHub

Current version: 1.12.1

Requirements: macOS >= 11

Versions:

Intel tahoe 1.12.1
sequoia 1.12.1
sonoma 1.12.1
ventura 1.12.1
monterey 1.12.1
big sur 1.12.1

Analytics:

Installs (30 days)
mqttx 352
Installs (90 days)
mqttx 956
Installs (365 days)
mqttx 4,148