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: 1.11.1

Current version requires: macOS >= 10.11

Versions:

Intel sequoia 1.11.1
sonoma 1.11.1
ventura 1.11.1
monterey 1.11.1
big sur 1.11.1
catalina 1.11.1
mojave 1.11.1
high sierra 1.11.1
sierra 1.11.1
el capitan 1.11.1

Analytics:

Installs (30 days)
mqttx 332
Installs (90 days)
mqttx 1,041
Installs (365 days)
mqttx 4,219
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