Xnec2c is a high-performance multi-threaded electromagnetic simulation
package to model antenna near- and far-field radiation patterns for
Linux and UNIX operating systems. The original FORTRAN version of NEC2
was ported to C by Neoklis Kyriazis, 5B4AZ and released as nec2c. Later
he wrote xnec2c, a graphical interface for ease of use with many more
features:
Multi-threading operation on SMP machines
On-demand Calculation
Built-in NEC2 input file editor
Accelerated Linear Algebra Support
Interactive Operation
User Interface
Color Coding
and much more.