Generally speaking, it depends on just how high a frequency you're talking about; but, most 3D electromagnetic solvers do poorly with gigahertz and higher frequencies. In my opinion, it is easier and best to use analytic tools to solve the problem in electromagnetism. Lastly, you could try COMSOL, but it is expensive, laborious to implement and gives poor results.
Up to 1MHz would be very useful. Up to 10MHz would exceed my domain of interest
Just a colored picture of magnetic field intensity [H in ampere turns/meter] at DC would be a huge step forward, if I could choose any 2D view from a 3D solution of two round conductors in a close proximity skew crossing, with the same moderately high current, in both wires.
I added a few resources I could find for free software, in order, for you to produce a picture. If you do a google search, you will find many pictures for a single wire, etc... You can also use Inkscape or Tikz, they are both free drawing software programs.
Louisiana, Thanks for the links. I have posted a topic on MaxFem forum site, to see if someone might do my work for me. It will be a while before I learn the MaxFem program.