Reads Gerber-274X and Excellon plotter data for printed circuit boards and outputs the data to a bitmap or directly to a printer. The plotter data is displayed graphically and can be moved around.
NecJGui is an antennas design tool, interface for Numerical Electromagnetic Code. It allows easily making NEC input files, and viewing them in 3D. It also contains a version of the simulator, so it's complete IDE for full-wave EM simulation.