This is a tool that I needed for designing my own coils and to understand the tradeoffs in choosing coil width, depth, and most importantly, wire gauge. These impact the magnetomotiveforce (you usually want more of that) and the heat (you want less of that) and the the amperage (which you may have to limit to match your circuits other components.)
Like all Public Invention projects, it is complete free.
Hopefully this video explains the project well:
Enjoy this project?