Geant4 includes many cross-platform file-based visualization drivers, together with the lightweight inexlib for basic analysis. Geant4 does not require any additional software over and above that listed in Section 1.2 to build and install these components.
However, you may wish to install the software suggested below to make use of these components when running your Geant4 application. We again emphasize that you do not need these packages to build and install Geant4.
DAWN postscript renderer (for use with DAWN visualization driver).
VRML Browser (for use with VRML visualization driver).
OpenScientist interactive environment for analysis.
For more details on Geant4's visualization and analysis components, you should consult the relevant sections in the Geant4 User's Guide for Application Developers.