A free program for Android, by Art Of Tunnel.

Why OpenTun?

The main reason to use OpenTun is that it is 100% free for you to use and it allows you to browse the internet safely and securely. You can access a secure connection with only one click and the connection will not slow down your browsing speed at all.

Using this app, you can connect to hundreds of servers from about many countries around the world such as United States, Canada, United Kingdom and more. It will keep your information protected while browsing as it uses the OpenVPN protocol, which has a very high level of security and privacy.