VPN or Virtual Private Networks can be used to transfer any data from one computer to another by using Peer to Peer connection. How about if this ability used as Instant Messaging / Instant Messenger? Or for Gaming, File Sharing and others?
Wippien is Free answer of that. Wippien is an application that would allow you to establish direct P2P (Peer to Peer) between your friends. Wippien used NAT tranversal techniques to make direct connection between peers.
Features in Wippien
The most useful and great features about Wippien are the capability to share files and exchange message that not only using P2P but using others IM protocols such as ICQ, MSN Messenger aka Windows Live Messenger / WLM, Google Talk, Jabber, AIM aka AOL Instant Messenger, Yahoo Messenger and others. Bot visual and audio. That means you can use wippien as voice chat and also video chat (webcam chat)
Wippien available in free, whether you used it commercially or personally. It has open source code. Working well in Windows Series: XP, Vista, 2000 and Linux others.
You can download Wippien free below: Download Wippien (1.92 MB) (for Windows)
For Linux users, just open this page to further understanding.