For a general High Energy Physics simulation workflow:
Geant4 — detector simulation
PYTHIA or MadGraph5_aMC@NLO — event generation
ROOT — analysis
Delphes — fast detector simulation
FastJet — jet reconstruction
GENIE — neutrino interactions
CORSIKA / ZHAireS / NuRadioMC — cosmic ray and radio-neutrino work
For your interest in radio neutrinos / Askaryan radiation, the most relevant tools are:
NuRadioMC, NuRadioReco, ZHAireS, CORSIKA, CoREAS, Geant4, GENIE, PROPOSAL, ShelfMC.