RRC-SCS: Secure Shell
Secure Shell (SSH) is a protocol for a client to securely access a server over an insecure network connection.
Although SSH is technically not a VPN, it is capable of VPN-like features. SSH is not limited to console access and is fully capable of transferring files and tunneling graphics and video (including audio).
There are many SSH clients available, but a few of the most popular open-source, freeware and commercial clients are: