TUN Server and Clients

    * mystun: STUN server and client library from the iptel.org guys. License: GPL, 
Homepage: http://developer.berlios.de/projects/mystun/. You have to download the file via 
CVS.
    * Vovida STUN server: STUN server and client library/application for Linux and Windows 
from the Vovida guys. License: Vovida Software License 1.0, Homepage: 
http://www.vovida.org/applications/downloads/stun/. The files are hosted at sourceforge.
    * WinSTUN: Windows STUN client. A nice application to test your NAT box. Homepage: 
http://sourceforge.net/projects/stun/.