Here’s a list of commercial RCS (Radar Cross Section) simulation software along with their main developers (OEMs):
Altair Feko – Altair Engineering Inc.
WIPL-D Pro – WIPL-D d.o.o.
CST Studio Suite (EMC/EMI and RCS modules) – Dassault Systèmes
Remcom XFdtd and WaveFarer – Remcom Inc.
CEMExpert – Zeus Numerix Pvt Ltd
ACES – KEYCOM Corp.
ISPAS RCS Simulation Tools – ISPAS (mainly for maritime applications)
Open-source and academic tools like NEC (Numerical Electromagnetics Code) also exist, but most defense applications use these established commercial offerings since they deliver higher fidelity, extensive support, and security features.
If you’re looking to compare specific capabilities (like solver types, GPU acceleration, or supported geometries), let me know!