Check out Tinkercad. I don't think the program simulator in it is as cool or as in-depth, but you can program a virtual Arduino with it and hook up wires to a b

Check out Tinkercad. I don't think the program simulator in it is as cool or as in-depth, but you can program a virtual Arduino with it and hook up wires to a breadboard along with many other common components and have some outputs too.