You have permission to download any of these files and use them as you wish.
GNU copyleft, means:
Do with these as you please.
Don't expect guarantees!
Name Description!_zipped-files/ All of the circuits plus some other files including this simulator.
falstad-cts/ Paul Falstad's circuits current to when I downloaded them on: 10 June 2017.
vinyasi-cts/ Vinyasi's circuits.
graphs/ Extra information for various circuits.
texts/ Useful textbooks on electrodynamics.