  This paper represents the vision of the members of the Fermilab Scientific
Computing Division's Computational Physics Department (SCD-CPD) on the status
and the evolution of various HEP software tools such as the Geant4 detector
simulation toolkit, the Pythia and GENIE physics generators, and the ROOT data
analysis framework. The goal of this paper is to contribute ideas to the
Snowmass 2013 process toward the composition of a unified document on the
current status and potential evolution of the physics software tools which are
essential to HEP.
