Review of Tunnelblick powered by the Slant community.
Tunnelblick is a free, open source graphic user interface for OpenVPN on OS X. It provides easy control of OpenVPN client and/or server connections.
It comes as a ready-to-use application with all necessary binaries and drivers (including OpenVPN, easy-rsa, and tun/tap drivers). No additional installation is necessary -- just add your configuration and encryption information.
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Pros
Pro Free and open source
Tunnelblick is available for free. It's licensed under GPL with source code available here.