Geant4 User's Guide
For Application Developers
Geant4 is independent of any histogramming package. The Geant4 toolkit has no drivers for histogramming, and no drivers are needed in Geant4 to use a histogramming package. The code for generating histograms should be compliant with the AIDA abstract interfaces for Data Analysis 
Consequently, you may use your favourite package together with the Geant4 toolkit.
Please refer to the JAS documentation on histogramming for using the JAVA Analysis Studio tool .
Please refer to the PI (Physicist Interfaces) project pages on histogramming for using an AIDA Interactive Analysis Environment .
Please refer to the Open Scientist Lab documentation on histogramming for using the Lab Analysis plug-in for the OnX package .
Examples in Geant4 showing how to use AIDA compliant tools for histogramming are available in the code distribution in the geant4/examples/extended/analysis, geant4/examples/extended/electromagnetic and geant4/examples/advanced directories.