tunnelblick.net
Tunnelblick is free, open-source software for controlling OpenVPN VPNs on macOS. It is distributed as a ready-to-use application bundling the necessary binaries and drivers, including OpenVPN, easy-rsa, and tun/tap drivers; users add their own OpenVPN configuration and need access to a VPN server. It is licensed under the GNU General Public License, version 2.