Minecraft Java 1.21 Mods
Browse 3,577 free mods for Minecraft Java 1.21 — popular picks include SnowInAllBiomes, FlowerLuck, JungleLeap.
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SnowInAllBiomes
This is a mod that allows the snow function to work in every single biome, its also configurable to add the highest layers you want, this is perfect for a christmas world. Only made as the other snow mods that do this are extremely outdated and dont work.

FlowerLuck
Luck bonus in flower forests.

JungleLeap
Jump boost in jungle biomes.

SnowStability
Slow falling in snowy biomes.

ForestGrace
Haste boost in forest biomes.
minon mod
this mod add the, minon biome, and minon pickaxe, minon painting 1 by 1 btw, and minon block
Biomes plus
Biomes Plus — 7 new biomes: foggy grove, lost forest, misty highlands, driftwood swamp, windswept plains with menhirs, olive grove, salt basin.
Mod but my Friends decided what's in it
lots of stuff, a huescape dimension, dragons, epic cave biome with game-changing mob, eldritch horror spider, Son Goku and more!!!1!!!
Winter Wonder
This mod adds a new biome called "Winter Wonderland"

SwampVeil
Resistance buff while in swamp biomes.

OceanBreath
Water breathing while in ocean biomes.

SnowyDash
Speed boost while in snowy plains biomes.
Cobalt's Wilder Worldgen
Makes Biomes Massive, and Implements a lot of Other Changes for a More Fun Exploration Experience
DunoLoons Cow
Adds a Cow-themed Hot Air Balloon to Birch biomes, complete with its own custom loot. Fully tested for 1.21.9 to 1.21.10 — a small touch that makes Minecraft’s empty skies feel alive again.
biome_and_portal
It adds new worlds new areas and music sharper than explosives in the trees
DunoLoons Frog
Adds a Frog-themed Hot Air Balloon to Mangrove Swamp biomes, complete with its own custom loot. Fully tested for 1.21.9 to 1.21.10 — a small touch that makes Minecraft’s empty skies feel alive again.
DunoLoons Mooshroom
Adds a Mooshroom-themed Hot Air Balloon to Mushroom Fields biomes, complete with its own custom loot. Fully tested for 1.21.9 to 1.21.10 — a small touch that makes Minecraft’s empty skies feel alive again.
Exto
This mod adds a unique horror mod boss that has a rare chance of spawning in the dark forest, the badlands etc.
LegionX Farm Mechanics
Realistic crop growth for Paper servers. Crops need light and water, cactus flowers need open sky, biomes affect growth speed, and neglected farms wilt over time.
CharredNM
This mod adds a new biome, structure, weapon, and boss into the game, all to make your minecraft experience just a little bit better.
SrCSkyblock
Void world generator with biome and structure preservation.
Biomes SMP
This plugin makes the server a lot more interesting with biomes, including teams of the biomes and a huge battle!
[RU] Terralith biome translation fix
Текстовый пак с русской локализацией биомов для Terralith на карте
TeaTM's Arctic Expansion
This is a relaxed non-combat mod that expands the arctic biomes with mechanics, mobs, items, and decorations.
Northstar: Venus Expansion
This datapack adds 6 new biomes and several new structures to the Venus dimension of Northstar
Solid Jungle Trapdoor
Removes the window from the jungle trapdoor!
Jef's Living Forests
Makes the forests more... alive?
Relic of Fate Resource Pack
Custom faceted gemstone textures for the 10 elemental relics — Blood, Earth, Inferno, Frost, Phoenix, Shadow, Storm, Nature, Void, and Wind.
Clearer Soil
High-contrast, sharp, and brownish textures for Coarse Dirt and Rooted Dirt. Easily distinguish them from regular grass and soil in heavily modded biomes.
AVS Biome
Replace Entire Biomes in One Command
Birch Forest
A resource pack that changes all diamond-related textures, including every diamond tool, weapon, armor piece, and item. It also slightly redesigns the GUI and replaces all log and stripped log textures with birch versions.
Pan’s End Palette
This datapack changes the end biomes to use purple colors for water, grass, leaves and more!
BiomeModes
A configurable Paper plugin that assigns different gameplay modes to different biomes.

Idyllon Biome-Dependent Stone Add-On
This is a resource pack that adds a few different textures to stone/ores/stone-derived blocks in certain biomes that would reasonably have different types of stone. Requires Continuity or Optifine.
Solid Jungle Door
Removes the window from the jungle door!
Winter World
This data pack turns the entire Overworld into snowy biomes.