x11vnc allows one to view remotely and interact with real X displays (i.e. a display corresponding to a physical monitor, keyboard, and mouse) with any VNC viewer. In this way it plays the role for Unix/X11 that WinVNC plays for Windows.
It has built-in SSL/TLS encryption and RSA authentication, including VeNCrypt; UNIX account and password login support; server-side scaling; single port HTTPS/HTTP and VNC; Zeroconf service advertising; and TightVNC and UltraVNC file-transfer. It has also been extended to work with non-X devices: webcams and TV tuner capture devices, embedded Linux systems such as Qtopia Core, and natively on Mac OS X Aqua/Quartz.
Please visit the main x11vnc site.
NOTE: For the x11vnc source code file releases at Sourceforge (i.e. x11vnc-0.9.x.tar.gz), see the LibVNCServer releases.
This project, http://sourceforge.net/projects/x11vnc, currently only releases miscellaneous x11vnc binary executables for various platforms in a release package named "x11vnc_misc_unix_bins".
You probably do not want any of these binaries; they are fallbacks for people who cannot compile, etc.
So go to LibVNCServer: http://sourceforge.net/projects/libvncserver, for the real stuff.
Here is the Sourceforge "x11vnc_misc_unix_bins" miscellaneous Unix binary executables file release.
Here is the Sourceforge http://sourceforge.net/projects/x11vnc project page.