Below are commands for WillowSMP and what they do.
/tpa - Request to teleport to the specified player.
/tpacancel - Cancel all outstanding teleport requests. Specify [player] to cancel requests with them.
/tpaccept - Accepts teleport requests.
/rtp - Teleports you to a random location.
/msg - Private messages the specified player.
/sethome - Set home to your current location.
/back - Teleports you to your location prior to tp/spawn/warp.
/spawn - Teleports you to spawn.
/buy - View server ranks in game.
/backpack - Open your backpack.
/shop - Opens the shop GUI.
/sell - Allows you to sell items.
/pay - Pays the specified player.
/bal - Shows a players balance.
/baltop - Shows a list of balances for players.
/ah - Opens Auction House.
/ah sell - Sells the item in your hand for the specified price
/ah cancel - Cancels an Auction
/bikeShop - Opens the Bike shop.
/carShop - Opens the Car shop.
/trainShop - Opens the Train shop.
/raftShop - Opens the Raft shop.
/planeShop - Opens the Airplane shop.
/parachuteShop - Opens the Parachute shop.
/tankShop - Opens the Tank shop.
/helicopterShop - Opens the Helicopter shop.
/submarineShop - Opens the Submarine shop.
/broomShop - Opens the Broom shop.
/hoverBikeShop - Opens the Hover Bike shop.
/drillShop - Opens the Drill shop.
/racingCarShop - Opens the Racing Car shop.
/sportBikeShop - Opens the Sport Bike shop.
/tractorShop - Opens the Tractor shop.
/mechaShop - Opens the Mech shop.
/bikeList - Opens the Bike list.
/carList - Opens the Car list.
/trainList - Opens the Train list.
/raftList - Opens the Raft list.
/planeList - Opens the Airplane list.
/parachuteList - Opens the Parachute list.
/tankList - Opens the Tank list.
/helicopterList - Opens the Helicopter list.
/submarineList - Opens the Submarine list.
/broomList - Opens the Broom list.
/hoverBikeList - Opens the Hover Bike list.
/drillList - Opens the Drill list.
/racingCarList - Opens the Racing Car list.
/sportBikeList - Opens the Sport Bike list.
/tractorList - Opens the Tractor list.
/mechaList - Opens the Mech list.
/ench info - Returns information about custom enchantments.
/ench lastorcol - Sets the color of your laser.
ANTHROPOMORPHISM: Uses Cobblestone to create projectiles while right clicking, left clicking fires all projectiles
ARBORIST: Drops more apples, sticks and saplings when used on leaves
BIND: Prevents items from dropping uppon death, respawning with the player
BLAZES CURSE: Makes the player immune to lava while making them take damage in Water
BLIZZARD: Slows down mobs around the target
BOUNCE: Shoots the wearer into space if they jump on slime
BURST: Shoots many projectiles at once
COMBUSTION: Whatever hits the wearer is on fire after that
CONVERSION: Converts XP to health when right clicking and sneaking
DECAPITATION: Has a chance of dropping the head of the mob after it was killed
ETHERAL: Makes tools unbreakable
EXTRACTION: Gives you ingots and XP instead of raw ores
FIRE: Smelts the block you are mining
FIRESTORM: The mobs around the target are lit on fire
FIREWORKS: Creates deadly fireworks around the target
FORCE: Launches enemy away from you
FROZEN STEP: The original ice walker enchantment
FUSE: Primes TNT that was hit
GERMINATION:
GLIDE: Slows down your fall when shifting
GLUTTONY: Eats for you
GOLD RUSH: Chance of dropping gold nuggets while mining sand
GRAB: Grabs Items that you mine instantly into your inventory
GREEN THUMB: Grows the foliage around the player
GUST: Launches yourself in the air, at the large expense of health
HARVEST: Harvests fully grown crops within a radius when clicked
HASTE: Grants the Haste effect for you
ICE ASPECT: Freezes the target
JUMP: Grants the effect of leaping
LASER: Shoots a deadly mining laser The color of the laser can be modified via /lasercol
LEVEL: Grants additional XP
LONG_CAST: Makes your fishing rod have x-tra long range
LUMBER: Breaks the entire tree at once
MAGNETISM: Slowly attract the items towards you
MEADOR: Jump and Speed in one enchantment
MOW: Enlargens the range of your shears
MYSTERY FISH: Chance of fishing living creatures
NETHER STEP: Like frozen step, but works on lava
NIGHT_VISION: Grants night vision on the user
PERSEPHONE: Plants seeds from the players inventory around them
PIERCE: Changes the way the pickaxe breaks blocks. For example it has a 3 blocks horizontal break range or a ore mode, which works like the Vein Miner mod/plugin
PLOUGH: Ploughs large portions of lands at the same time
POTION: Grants positive effects on the user when shooting arrows
POTION RESISTANCE: Reduces the effect of all potions
QUICK SHOT: Allows to shoot many arrows at once
RAINBOW: You can get other variants of wool or flowers with the enchantment
RAINBOW SLAM: Creates a deadly rainbow spiral that damages the target
REAPER: Gives the wither effect on the target
REVEAL: Reveals the postion of nearby ores
SATURATION: Keeps hunger higher than usual, allowing you to walk greater distance at lower food intake
SHORT_CAST: Reduces the range of your fishing rod greatly
SHRED: Shreds through stone and creates a lot of lag
SIPHON: Siphons enemy health from the opponent
SONIC SHOCK: Damages Mobs as you are zooming past them with your elytra
SPECTRAL: Unbalanced enchantment that converts blocks to similar blocks (e. g. converts oak planks into spruce planks)
SPEED: Gives a bugged speed effect to the user
SPIKES: Damages nearby entities as you jump
SPREAD: Shoots more arrows than usuall at once
STATIONARY: Negates any knockback effect when attacking mobs, leaving them clueless as to who is attacking
STOCK: Refills your slot in hand automagically
STREAM: Creates a trail of particles when in flight
SWITCH: Replaces the block you are targetting with the leftmost block in your inventory
TERRAFORMER: Places a lot of blocks at once
TOXIC: Sickens the target making them nauseous and unable to eat
TRACER: Guides the arrow to targets and then attacks
TRANSFORMATION: Has a chance of transforming one mob into another
UNREPAIRABLE: Curse that prevents the item from being repaired
VARIETY: Drops other variants of leaves, saplings and logs
VORTEX: Teleports any loot from mobs straight into your inventory
WEIGHT: Slows you down, but gives you better knockback resistance against enemies