You can still get proper creosote, and it's fantastic stuff, but you do need to be very careful with it.
You can buy a product called creocote. It looks and smells like real creosote, but it doesn't have the nasty chemicals in it , and doesn't really preserve wood.
One or two of the other wood treatments are OK ish , but not much is as good as creosote.
My Mrs workshop is painted with ronseal shades . It's a sort of plastic coating, that lasts about five years or so, and looks much more attractive than creosote.