nperf

Install command: 
brew install --cask nperf

Name: nPerf

Internet speed test utility

https://www.nperf.com/

/api/cask/nperf.json (JSON API)

Cask code on GitHub

Current version: 1.12.3

Variations:

Intel sonoma 1.12.3
ventura 1.12.3
monterey 1.12.3
big sur 1.12.3
catalina 1.12.3
mojave 1.12.3
high sierra 1.12.3
sierra 1.12.3
el capitan 1.12.3

Analytics:

Installs (30 days)
nperf 35
Installs (90 days)
nperf 89
Installs (365 days)
nperf 89
Fork me on GitHub