Cover scents. All of them. I used to hunt a farm with multiple big groves of cedars, so I used the cedar cover scent most often.
Doe-in-heat scents. I don't know what that stuff was, but it wasn't deer pee. It smelled awful.
Deer sucker. Someone gave me one, so I tried it. Had a doe group with a yearling buck tagging along, and when that yearling smelled the sucker, he came over, grabbed it in his mouth, yanked the whole thing out of the ground and ran off with it, the doe group hot on his tail. For 200 yards I could hear that buck running through the underbrush with the sucker's stick clickity-clacking against every limb. It worked but...
As an addendum, in the category of "Best product other hunters think is a waste of money:" Scent-reducing soaps. They are the bomb, and truly help if you have scent-jumpy deer. The deer can still smell you but they will assume you are much farther away than you really are.