Minecraft Java 1.21 Mods
Browse 3,671 free mods for Minecraft Java 1.21 — popular picks include Expensive Diamonds, Awesome Mode, Aggressive Axolotls.
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Expensive Diamonds
Makes Diamonds renewable by crafting and blasting [smelting in a blast furnace] a reworked chicken spawn egg.

Awesome Mode
An awful troll datapack with things you wouldn't expect
Aggressive Axolotls
This data pack make axolotls attack every mob including the player.
Dominus
Dominus is a Paper 1.21+ plugin that lets trusted operators secretly control a Minecraft server — shaping the world with powerful tools or walking among players disguised as any mob — while remaining completely undetectable.
Veganism
Entities react to being hit and take revenge, animals scream and summon the Spirit of the Animals, and eating meat is punished by the Veganism effect. Supports Russian and English.
Osmium
Datapack that tweaks/adds loot tables and recipes.
Random Eventy
When creating a new world you have a new button, there you can configure the randomness of your survival world!
Vanilla Copper Golem Additions
Small improvements to the Copper Golem with vanilla-style mechanics, interactions, and behaviors
Horse Armor: Recrafted
Adds more crafting recipes for horse armor.

Craftable petrified oak slab
Added craft to petrified oak slab
NerfJockey
This plugin nerfs baby zombies
NoSpawnerEggs
Blocks defined spawn eggs from entering mob spawners
More Pets
Adds more vanilla+ pets to minecraft!
Wednesday Frogs
Mimics Wednesday Frogs from the craft mine update.
Unrideable Pig
Prevent pigs from being saddled
Limited Life [NanoVirus]
You have 48 hours to live. By killing mobs you can get MORE time
MoreBurning
Make more hostile mobs burn in the sun.

Creeper don't Destory blocks
(TNT is unaffected) Creeper explosions won't destroy blocks. Ender Crystal explosions won't destroy blocks. Ghast fireballs won't destroy blocks.
CorePerformanceFix x SortSmart
A high-performance optimization plugin focusing on entity-ticking efficiency and automated item-stacking and you can use SortSmart
Overlooked
Overlooked is a Minecraft mod that adds new uses, recipes, and mechanics for items and systems that are already in the game but usually go ignored. Hence the name, features that I believe were 'overlooked', to make it more immersive, and fun!
Ananke WorldControl
The ultimate, lightweight tool for granular control over Minecraft physics, player stats, mob griefing, and crafting. Block anything, anywhere.
SoulCommand
SoulCommand is a Minecraft 1.21.4 Bukkit plugin that lets hostile mobs temporarily possess players, causing them to lose control and exhibit eerie behaviors before breaking free.
Fast Ghast - VB Addon
VanillaBackport addon for Minecraft 1.21.1. While riding your Happy Ghast, hold up a Ghast Tear and your little companion will unleash its full power.
Creepy Colorful
Creepers are now a colorful bunch thanks to Creepy Colorful!
MC Unbalanced World
A great overhaul to survival progression, adds 30+ hours of content, to enjoy alone or with friends
creatifight
A new gamemode for players who want the thrill of building and fighting without worrying about damage and dying. Like creative mode, but with aggressive mobs to battle.
XySmallTool
Lightweight Fabric mod to control mob spawns, explosion griefing, enderman behavior, farmland trampling, and wither skull lifetime via an easy-to-edit YAML config.
Desert Monsters Drop Sand
Husks and Parched drop sand and red sand upon death, allowing them to be farmed.
Being Alone (BE)
This mod makes you feel alone... because you are...
Colored Shulkers
Adds variety to Shulkers by making them in different colors. Naming a Shulker Jeb, will make it act like a Jeb Sheep!
PandasSneezePlus
Increases baby panda sneeze rate and allows adult pandas to sneeze. Potentially dropping slimeballs.
Speedrun Scientology
Explore a new dimesion containing an infinite dungeon where you can explore, loot, and fight monsters as you try to escape.

LimonMobToggle
A lightweight mob toggle plugin available for free.
More Mobs Drop Things
Adds drops for more passive mobs, including goats, sniffers, and ocelots.
SognoDiGhast
A simple yet configurable plugin to boost regular and happy ghasts speed.

Nautilus Drops│鸚鵡螺掉落物
Nautilus will drop items when killed in any way.│鸚鵡螺無論以何種方式被擊殺都會掉落物品。