There are many VPN clients out there, but a few are definitely ahead of the pack. We recommend the following clients currently, but things can change as software is updated and new clients come to market.
Ghost Path VPN Client: This one is obvious because it's designed to work seamlessly with our service. Learn how to setup the Ghost Path VPN client here.
Viscosity: A beautiful and easy to use OpenVPN client. It's cheap at around $10 and works with Windows and Mac. Purchase Viscosity here.
Tunnelblick: A free alternative to Viscosity that works in much the same way. It's not packaged quite as neatly as Viscosity, but the performance and reliability are there. Download Tunnelblick here.