GEMC

gemc (GEant4 Monte Carlo) is an application by Jefferson Lab that incorporates Geant4 libraries to simulate particles passing through matter. The definitions for its simulation parameters, such as geometry and fields, can be found in MySQL, C++, text, and GDML databases.

Operating Systems
gemc supports 32- and 64-bit Linux as well as Mac OS X.

Links/Sources
GEMC homepage: https://gemc.jlab.org/gemc/Home.html