elmerfem.org 3. OpenFOAM (with electroMagnetics solvers) Best for: Advanced users needing transient or coupled plasma/MHD simulations. Platform: Linux, Windows (WSL), macOS. License: GPL.
Motor design, solenoid actuators, magnetic levitation, transformer leakage fields.
-- Draw a coil (rectangle with current density) mi_drawrectangle(-10, -5, 10, 5) mi_addblocklabel(0, 0) mi_selectlabel(0, 0) mi_setblockprop("Copper", 0, 1, "Air", 0, 0, 1e6) mi_clearselected()
openfoam.com 4. QuickField Student Edition Best for: Students learning electromagnetic simulation. Platform: Windows. License: Free for non-commercial educational use.