c8501024 / Hertzon

Open-source 3D full-wave EM simulator (FEM) with adaptive meshing for antennas, filters and waveguides, built on EMerge.

potatobeanradio / circuitRF

Full featured, cross-platform RF circuit + electromagnetic simulator. DC, S-parameters, harmonic balance, loadpull, envelope. Also supports 2D and 3D layout and design and electromagnetic MoM, FEM, FDTD + thermal FEM.