NoMachine NX is the next-generation X compression and roundtrip suppression 
scheme. It can operate remote X11 sessions over 56k modem dialup links or 
anything better. 

This package contains a free (GPL) implementation of the nxserver component.

WWW: http://www.nomachine.com/
WWW: http://www.kalyxo.org/twiki/bin/view/Main/FreeNX