Custom made 3-point harrow (drag). It is 5' x 5' and has a chain link fence that smooths loose dirt/gravel. It can be adjusted to have the rear (shown) drag the ground while the front is raised or it can be set so the entire harrow drags the ground. This thing works amazingly well. I used it to drag a field that I had ripped with my box scraper tines after I killed the grass. It dragged the dead grass clumps out as it leveled the area.
I use concrete blocks to ensure the chain links stays firmly on the surface