NordVPN - NordVPN offers VPN technology that encrypts data twice.
OpenVPN - OpenVPN - The Open Source VPN
TunnelBear - Really simple VPN to browse the web privately & anonymously.
SparkLabs - SparkLabs's Viscosity is the OpenVPN client that lets you secure the network.
Cloak VPN - Stay safe online when using untrusted networks
LiquidVPN - LiquidVPN creates an encrypted tunnel between the device and the servers via a secure Virtual Private Network.