Geant4 is a toolkit for the simulation of the passage of particles through matter. Its areas of application include high energy, nuclear and accelerator physics, as well as studies in medical and space science. The three main reference papers for Geant4 are published in Nuclear Instruments and Methods in Physics Research A 506 (2003) 250-303,  IEEE Transactions on Nuclear Science 53 No. 1 (2006) 270-278 and Nuclear Instruments and Methods in Physics Research A 835 (2016) 186-225.

Applications A sampling of applications, technology transfer and other uses of Geant4	User Support Getting started, guides and information for users and developers	Publications Validation of Geant4, results from experiments and publications	Collaboration Who we are: collaborating institutions, members, organization and legal information