Helix.zip contains two beta programs with little or no documentation. Helix is a helical antenna design program. Helixres is a helical resonator design program. These are a work in progress, but may be useful.
Both programs are unfinished and may not work as anticipated. They are mouse event driven, but do not install any kind of interupt handler, and do not access disk drive in any way. In the event that they do "crash" due to a lack of error checking, there should be no adverse affects to your equipment.