- G4DNA
- Geant4-DNA project
- G4MED (in Japanese)
- Geant4 Medical Physics in Japan
- G4NAMU
- Geant4 North American Medical User Organization
- GAMOS
- Geant4-based Architecture for Medicine-Oriented Simulations
- GATE
- Geant4 Application for Tomographic Emission
- TOPAS
- Geant4 Monte Carlo Platform for Medical Applications
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