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CHAMP by TICRA (Mode Matching + MoM)
SRSR4D by FRANCE TELECOM (MoM)
These are the best that I used.
They can be used only for rotationally symmetric horn but are fast and accurate.
CHAMP has got an easy GUI. SRSR4D is harder and works only on Linux but permits to simulate dielectric material as well.
Valerio
Valerio,
Do you have a website or contact information for SRSR4D.
I suggest HFSS...more accurate and faster. If more memory, who cares...use symmetry planes and mixed order tets to reduce problem size. you can also use their new FEM/MoM hybrid solver in which you have the same accuracy with significantly less resource consumption.
have fun