x0vncserver - VNC server which continuously polls an X display
is a VNC server which continuously polls any X display, allowing it to be
controlled via VNC. How usable it will be depends a lot on the machine it's
running on, and what you're expecting. It won't be as fast as Xvnc or a native
X server with VNC support compiled in, but in many cases it is the best option
since it is just an ordinary X application requiring no special installation.
It has many of the same parameters as Xvnc. Running
-h will give a list of parameters with descriptions. Note that,
unless you specify a value other than VncAuth for the
UserPasswdVerifier parameter, you will need to explicitly specify an
appropriate password file using the PasswordFile parameter.