UltraVNC

I found this one: http://code.google.com/p/gitso/

I created successfully SC with the website and used it for long time to support Windows from my Debian Lenny. Therefore I simple started

xtightvncviewer -encodings "hextile copyrect" -listen

on my Lenny. Suddenly on one of my Lenny machines it didn't run anymore. There was only

xtightvncviewer ...