DirectVNC is a variant of a VNC Viewer specifically for Linux systems. 
Unlike other VNC flavors for Linux, DirectVNC takes advantage of the 
"linux framebuffer device", via the DirectFB library. This means that 
the VNC Viewer no longer needs to have a full-fledged X-server installed. 
Instead, the Viewer device can be running the relatively tiny DirectFB 
library: http://www.directfb.org, making DirectVNC suitable for 
deployment on small-footprint think-clients and embedded Linux platforms 
such as LEAF: http://leaf.sourceforge.net.

You can download a copy of DirectVNC here: 

            http://www.adam-lilienthal.de/directvnc/