different setups for 20, 30, and 40 hp classes of tractors. 50 and on up there is normally something already out there that farmers are already using i would suspect.
hooks on top of front bucket be more of a standard vs having to weld them on later. perhaps a slip on kit with some bolts
smaller size spot sprayer / boom sprayers to fit SCUT and CUT via 3pt hitch, with pto pump
hyd chain saws
smaller size backhoes that have a hook or a slip in trailer hitch or something. to drag rock sled, or tree or what not behind tractor without having to take off backhoe or try to get chains up around everything.
optional side mounted boxes over rear tires, that are actually big enough to hold some tools. or for me to be able to hold 5 gallon buckets.
kits to use say 30 gallon or 55 gallon plastic or metal drums. to turn into sprayers, or a tool bucket or rear ballast via 3pt hitch.
better yet, kits to turn 30 / 55 gallon drums into spot sprayers or boom sprayers, but ability to hook up a short garden hose. to water trees and flower beds. that are clear off away from the house / shed. prefer PTO pump that is not a diaphragm type. so diaphragm is not being replaced every couple years.
boom pole fit over front loader bucket. or replace it. to deal with building a shed to lift metal sheets up to the roof, or to set the *duh mind blank* rafters?
pto concrete mixer 1 or 2 baggers.
3pt hitch material stand. to hold some wood, concrete or plywood, or even toss some dirt on it. with some adjustable legs via pins and holes. kinda of a work bench that hooks up 3pt hitch. type of deal.
12v to 110v converter, for a small tool. that can be just left on tractor. even if tractor and converter was left out in the rain. my choice would be on a rear fender placement.
grass catchers and vacuum trailers for grass can always be nice but... a smaller size vacuum ran off of PTO, that folks could use 30 gallon or 55 gallon drums, or 230 or 330 square tex totes with. to say getting gravel out of the yard after snow plowing is done for the season. or to hook up to mower deck. or to suck up a old mulch bed / flower bed, preferable. 3" or 4" hose, that anyone could pick up at local hardware store, to use as hoses for it. uniseals ((rubber flanges)) for going through side of drum, or 3" or 4" toilet flanges for going through top or bottom.
if going to small size city ponds, for koi and goldfish, then it would be a PTO pump that has 10 to 15 feet of water head loss / max head pressure, with high as possible gallons per hour of water. then another pump with 10 to 30 feet of head loss / max head pressure with as many gallons per hour as possible.
modified 30 gallon or 55 gallon vacuum noted above. but to be able handle water and small size rocks. to muck out 200 gallon to 12000 gallon liner ponds.
if hyd saws were done then perhaps. a smaller size tiller ran off of hydraulics of tractor. to deal with after plants are put in, and tilling between rows of crops to remove weeds. ((just one less engine you have to deal with)) perhaps just a hyd motor kit. to switch over regular gas engine walk behind tillers to hyd motor with hoses.
smaller size generator that ran off of hydraulic hook ups vs PTO shaft for a tad more power that what a 12v to 110v convert can do. hyd hook ups, so it can be placed were ever it is needed. and not directly taking up spot for 3pt hitch area. which most likely has something attached to it.
slip on over bucket metal post driver for fences. so the FEL can just use weight to push metal posts down into the ground.
smaller size hay cutter, and bailer, so folks might be more opt to plant certain areas that they more likely just grow to weeds. perhaps bailer just makes small size square bails that flop out onto the ground without need to lift up to a hay wagon that is being pulled behind it.
smaller size bucket options for the FEL. to make digging a little bit easier. vs having to go with a backhoe.