tunnelblick

Install command: 
brew install --cask tunnelblick

Name: Tunnelblick

Free and open-source OpenVPN client

https://www.tunnelblick.net/

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

Cask code: tunnelblick.rb on GitHub

Current version: 8.0,6300

Requirements: macOS >= 13

For security reasons, tunnelblick must be installed to /Applications,
and will request to be moved at launch.

Analytics:

Installs (30 days)
tunnelblick 1,186
Installs (90 days)
tunnelblick 3,342
Installs (365 days)
tunnelblick 13,994