QUCS, (http://qucs.sf.net), is a powerful open-source circuit simulator, python-qucs is a Python package that allows to automate the process of preparing input netlists for several simulations, run them, and export the results.
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NEC2++ is a C++ rewrite of the Numerical Electromagnetics Code (NEC-2) with many new features like automatic error detection when you specify the structure incorrectly and much faster execution. Nec2++ can analyse radiating as well as scattering properties of structures. The simulation engine in Nec2++ is compiled into a library for easy integration into automatic antenna design systems or GUI tools. Examples are included for using Nec2++ from C/C++, Ruby and Python.
PyDSTool main development repo
openEMS is a free and open electromagnetic field solver using the FDTD method.
Minimal GUI Application using the QCSXCAD library.