Hello everyone,
I know this is not the optimum category to put this ( Fighter maybe you can introduce a new category as software ? That would be usefull ) but I want to share a usefull piece of software that I have found recently. It is called Coil 64, I use it on linux, the portable version of the software and maybe someone else needs some help with designing coils. This is the site where I found it: https://coil32.net/download.html
The site has also other interesting segments like color coding of inductors, theory related to inductor geometry, etc. Anyways, I hope this helps someone.
P.S.: Fighter, fell free to move this thread if needed.