OpenVpn

OpenVPN is an open source software application that implements virtual private network (VPN) techniques for creating secure point-to-point or site-to-site connections in routed or bridged configurations and remote access facilities.
It uses a custom security protocol that utilizes SSL/TLS for key exchange. It is capable of traversing network address translators (NATs) and firewalls.
It was written by James Yonan and is published under the GNU General Public License (GPL).
OpenVPN uses the OpenSSL library to provide encryption of both the data and control channels.
It lets OpenSSL do all the encryption and authentication work, allowing OpenVPN to use all the ciphers available in the OpenSSL package.
It can also use the HMAC packet authentication feature to add an additional layer of security to the connection (referred to as an "HMAC Firewall" by the creator).
It can also use hardware acceleration to get better encryption performance.
You can find openvpn here
You can create a VPN with openvpn by network manager.
To start OpenVpn type : openvpn --config file.conf
For more information about OpenVpn type : openvpn --help

If you have a problem or you need some explanations just write under this post!