See this about EchoVNC[0].
Latest version: 2.221
Released on: 25 Sept 2007
EchoVNC is a secure remote-desktop tool based on VNC. With it, a Windows PC
or OSX Mac can be remotely accessed regardless of firewall or router
configuration.
Standard VNC becomes "firewall friendly" -- no more port-forwarding!
EchoVNC comes with a VNC Viewer, and is designed to work with any
flavor of VNC server that you already have installed. EchoVNC uses
OpenSSL components to secure your data connections with 128-bit AES
encryption. To establish EchoVNC connections, you can either run your own
packet relay server or use our free one at "demo.echovnc.com".
[0] http://en.wikipedia.org/wiki/EchoVNC
[1] http://echovnc.sourceforge.net/fom-serve/cache/1.html
