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