This is a list I started when I first ordered my boat (list is still a work in progress). Some things may not apply to you and your boat but it might give you some ideas:
Safety Equipment
First Alert CO/Smoke alarms
Fire extinguishers
Ditch bag
Safety harness and tethers
Throwable PFD's
MOB recovery system
Personal strobes
Inflatable life jacket/harnesses (Mustang)
Extensive First Aid Kit
Survival suits
Sea Anchor
Jordan Series Drogue
Tapered plugs for leaks
Anchoring & Docking
Anchor ball
Boat hook
Dock lines (4 dock lines @ 50' & 2 spring lines @ 75')
Fenders
Robship Hook & Moor boat hook
Engine Room
Dry-erase board for engine room
Pelton ear protectors
Custom fit ear plugs
Oil absorbing towels
Fuel spill kit
Small drill press
Vice
Galley
Nesting set of pots & pans
Corelle dishware
Kitchen utensils
Knives & knife block
Portable instant hot water maker (for tea etc)
Small applicances (waffle maker, blender, food processor, stand mixer, sausage stuffer, juicer, slow cooker, Foodsaver, etc)
Zojirushib Home Bakery Mini bread machine
Stackable plastic containers
Stovetop espresso maker
Foodsaver bags
Cook book(s)
Plastic drinkware
Tabletop electric burner (for when you run out of propane)
Cleaning (partial list)
3M pads (green, white, black, etc.)
Trac Ecological cleaning solutions and pump to flush system
Toys
GoPro cameras & underwater case
GoPro pole mount
GoPro 3D steadicam
DJI Phantom 4 quad copter
Misc.
Magma "Rock 'n Roll" boat stabilizer.
Honda generator EU2000 (this is a back up generator to your main gen)
Solar lights for exterior night lighting (Home garden type solar lights)
Small flashlights (extra batteries)
Bosuns chair
Prop speed antifouling clear coat
Mini cargo hammocks
5-gallon buckets (4-6)
Soft cooler(s)
Fishing poles and gear/lures
Zip-Loc Space bags
Vacuum
Sewing machine - Sailrite LSZ1 Premium Package with cruisers spare pkg.
Fabrics (for flags, etc.)
Water jerry jugs
Chamois
Micro fibre towels
Rain-X
All types of gloves (fishing, mechanic, cloth, etc)
Repair & Spare Parts
Alternator spare parts kit for both alternators
Watermaker spare parts kit
Extra watermaker filters
Main engine spare parts package
Head repair kit
Spare impellers
Abundant spare fuel filters, primary & secondary
Electrical repair kit including fuses, breakers & bulbs
Big tube of silicone dielectric gel lubricant
Domestic water pressure pump w/ appropriate electrical & water connections pre-tested
Portable inverter
Extra oil
Extra coolant
Boeshield T-9 spray (2-4 cans)
WD-40 lubricant (2-4 cans)
Sail repair tape
Sail repair kit
Bungee cords
Halyard lines
Winch grease
Impeller lubricant/grease
Tools
Lincoln 175 Plus MIG welder
Bolt cutters
Good quality multi meter (DVOM), example Fluke
Hand held IR temperature gun
Good metric & standard size tool kit
4" grinder(s)
Sawzall
Milwaukee electric drill
Drill bits
Electrical & duct tape
Cordless drill
Butane torch
Mini screwdriver set
Hex wrenches
Electrical extension cord(s)
Head lamps
.