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Historical interest or very simple 3D checks.

comsol.com (request trial CD/Demo version) 7. Online & Browser-Based Tools | Tool | Type | Capability | |------|------|-------------| | MagneForce (web demo) | 2D magnetostatic | Simple coil/bar magnet fields | | Falstad’s EM Applet | Educational | Interactive field lines from currents/magnets | | p5.js / Three.js examples | Code playground | Visualize vector fields programmatically |

Motor design, solenoid actuators, magnetic levitation, transformer leakage fields.

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.