Code
tunnelblick-ipv6
IPv6 enabled tunnelblick is an OpenVPN GUI client for Mac OS X
Download here http://code.google.com/p/tunnelblick-ipv6/downloads/list
thanks jjo for his excellent openvpn ipv6 patch: http://github.com/jjo/openvpn-ipv6
And here is the Tunnelblick project: http://code.google.com/p/tunnelblick