Minecraft Java 1.21 Mods
Browse 750 free mods for Minecraft Java 1.21 — popular picks include Sharks Rubber Chicken addon, Shark's Enchant Cap, Elkonia Deep Coral Ocean Biome.
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Sharks Rubber Chicken addon
A mod that is all about RUBBER CHICKENS. It adds 1 new item, 2 new tools, and 1 new mob
Shark's Enchant Cap
Makes a Lower Max Level for Some Enchants, Aimed at Events
Elkonia Deep Coral Ocean Biome
My first Biome Datapack. this Biome is meant for 1.21.10 and is just as it says, a very deep ocean with some coral at the bottom. it's otherwise flat. Relatively 200 blocks deep, with some fish schooling, but otherwise just a flat ocean with mud, sand.
Lava Ocean
Adds A New Biome Called Lava Ocean!
Goggles B Gone
removes the annoying goggle overlay from Hybrid Aquatic's Diving Helmet; letting you explore the ocean as long as you like without having to view the world through a png with 50% opacity.
Calor
Calor is a worldgen datapack for Minecraft versions 1.21 and newer. It raises both the sea level and snow line.
Stained Glass To Beacon Sea Lantern
Changes Java Edition Changes Red Stained Glass to Sea Lantern Changes Green Stained Glass to Beacon
Chewing Gum
This mod adds a pack of gums with 3 pieces inside used to remove nausea
Ocean/River/Lush Caves Foliage Everywhere!
Changes the Foliage colormap so it always matches the Ocean/River/Lush Caves biome color – Part of the "Oh My Colormap!" collection.
Glazgo's Backrooms Texture Pack
this mod changes the textures of the bamboo wood set to backroom building blocks (and sea lanterns for lights)
Nautlius Tweaks
this datapack tweaks the Nautilus by making them more resistant to trident damage and removing the underwater mining speed penalty
oceanaxe
Adds a powerful ocean axe with custom abilities.
MobSouls
Adds MobSouls that can be crafted with heart of the sea and the mobdrop witch give special abilities
SeaAbilities
SeaAbilities Is a plugin for the ones that want sea creatures and sea abilities on their server. Its really fun and its custom coded.
Boilzone
Adds a new magma themed ocean biome.

OceanBreath
Water breathing in ocean biomes.
Island Cluster
A small island cluster in the middle of the ocean.

UnderwaterBoost
Dolphin grace while swimming.
Easier Sea Lanterns
Changes the current crafting recipe to a more balanced recipe.
Concrete in the Cauldron
Turn concrete powder into concrete using a water cauldron — no rivers or oceans needed.
Bedrock Ranged Mobs (Datapack)
Makes Skeletons that are underwater and trident drowneds less than 3 blocks away from the player do melee instead of ranged attacks, like in bedrock edition
Submerged: The Ocean Artifact
Dive into the deep! Defeat the Ocean Monument guardians to claim "Submerged," a brand-new custom music disc.

Legacy Islands
Datapack that causes 1024x1024 "islands" of regular generation to be surrounded by forced deep oceans.
JoJoStands
A JoJo-inspired Paper SMP plugin with Stands, abilities, leveling, Stand controllers, Requiem Arrows, and Stone Ocean features.

OceanBreath
Water breathing while in ocean biomes.
EvenIronGolemsRust
Even iron golems rust if they sink. A lightweight plugin that adds corrosion damage to underwater iron golems. (アイアンゴーレムだって、沈めば錆びる。水中の鉄ゴーレムに腐食ダメージを追加する軽量プラグイン。)
Heartless
Removes the Heart of the Sea from buried treasure chests. No conduits for you!
DrownedOverhaul
Drowned mobs can now grab and drag players underwater. A dangerous new twist to ocean survival!
Water Mace
This pack adds a water mace skin — deep ocean-blue shadows rising through cyan into a pale aqua highlight.
easy CORAL FANS
Tired of searching for warm oceans? Craft all Coral Fans easily using wool and dyes!
Better Conduit Recipe
Adds a new recipe for the conduit, now requiring prismarine. The recipe will now require you to explore the ocean more, instead of just luck.
GrandSeas
Survive the acid ocean! Build islands, manage teams, and dominate the toxic seas in this ultimate plugin.
Tiny Water Bubbles
Makes underwater bubble particles tiny and unobtrusive while keeping them visible.
TradeWinds
A BentoBox game mode of sea trading, smuggling, and piracy
Water Splashes and Waves Surface Data Pack (1.21.4, 1.20.1)
Water Splashes and Waves Surface Data Pack adds visual effects when you jump into water. This data pack gives you a splash animation every time you hit the surface of a river, lake, or ocean. It makes diving and falling into water look much better with custom particles. Features: Creates a visual splash effect right […]
Cobblemon Seavls Bizarremons Resource Pack (1.21.1, 1.20.1)
Cobblemon Seavls Bizarremons Resource Pack expands the main Cobblemon mod with over 30 weird and wonderful custom creatures. It brings totally new evolutions and regional forms to your game. You can find these strange monsters hiding in the nether, frozen oceans, and jungles. The pack also generates giant floating cities in the deep ocean full […]