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Tunnelblick is a free, open source Graphic User Interface (GUI) for OpenVPN on Mac OS X. It provides easy control of OpenVPN client and/or server connections. The program can be used to securely connect a Mac running OS X to an OpenVPN server. The server then connects the Mac to a remote network or to the Internet, bypassing untrusted networks, censorship, and eavesdropping.
To use Tunnelblick you need access to a VPN server -- your computer is one end of the tunnel and the VPN server is the other end.