From P2P Foundation

URL: http://socialvpn.wordpress.com/

The Social VPN Project

This is a free and open-source P2P Social Virtual Private Network (VPN) that seamlessly networks your computer with the computers of your friends so that:

• Your computer can communicate directly to computers of your friends, and all communication is encrypted and authenticated. In other words, you are in full control of who you connect to and all your communications are private.
• This private network is configured with no hassle. The social VPN does all the configuration automatically for you. All you and your friends need to do is run this software and log in to your XMPP backend (such as Google chat, or Jabber.org).
• You and your friends can communicate, share and collaborate in countless ways, with existing applications, like iTunes, Windows shared folders, and remote desktop. You can share files and folders, stream music and video, play multi-user games, access remote desktops, and run a Web server private to your friends.
• If you own multiple computers at different places, you can also use the Social VPN to seamlessly access your files, desktop, etc remotely – creating your own personal VPN.