Minecraft Java 1.21 Mods
Browse 22,257 free mods for Minecraft Java 1.21 — popular picks include Mob Swords, Dimensional Shulker Boxes, Mobmanity.
Step by step: How to install Minecraft Java mods & modpacks
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Mob Swords
This Datapack adds 20 New Mob Based Swords to the game

Dimensional Shulker Boxes
Vanilla-style per player pocket dimension.
Mobmanity
A minecraft datapack that makes mobs behave like different types of players. Mobs can use and spawn in with whole variation of vanilla items that they use in unique ways to attack you. Mobs can also spawn with behavior making every fight fully different!
Melodial
Bring the soundtrack to life-when you want, where you want.
LiftChest
Paper plugin for carrying chest on your hands
Blowgun and Blowdarts
Poison Darts! Tranquilizer Darts! Use your Blowgun to fight and surprise enemies!
Moon Spire
月尖塔为Minecraft添加了卡牌对战元素,允许你使用卡牌来挑战生物!Moon Spire adds card battle elements to Minecraft, allowing you to use cards to challenge creatures!
ItemCooldown
A simple and lightweight ItemCooldown plugin!
Back to Resources: Quartz
Allows you to turn quartz blocks back into quartz. Позволяет превратить блоки кварца в кварц.
Monier
Monier introduces a robust banking, economy system and real tradeable money to Minecraft. Whether you want to set up a server economy or just flex your wealth with high-value items, Monier has you covered.
NonStupidVillagers
Makes villagers better by disabling nitwits, making villagers look for jobs day or night, and making them instantly get jobs.
BGMSync
Background Music Sync: all players have synced music, perfect for group sessions
Easy Freezing
A mod that allows you to Freeze Time around you at will! Try with multiplayer and things get confusing fast!
Copper Repeaters and Comparators DP+RP
Changes redstone repeaters and comparators to be made out of copper instead of stone. Datapack and resourcepack.
JoinOpt
A perfermance plugin for edit minecraft join/exit messages with actions and welcome rewards.
Half Health
Players now spawn with 5 hearts instead of 10
Actual MiniBlocks
Lets you place blocks one eighth the normal size!
BetterSpawnProtect
BetterSpawnProtect is a plugin that allows you to block your server's players from performing certain actions within a radius
GreifPrevention Addon
GreifPrevention AntiClaim addon is a lightweight extension for GriefPrevention that prevents players from creating land claims too close to existing claims.
Hopper Filters
Add item filtering mechanism to Hopper. No need complicated Redstone
Mini Food Farms
Get all the food you want! We're starting off the menu with some healthy apples (there are even shiny ones)!
Crafter Spells
CrafterSpells introduces a collection of utility spells to enhance your Minecraft experience, inspired by the Summoner Spells from League of Legends.
Sol's Hardcore
A typical minecraft hardcore with a few mods that help the player and add some new mechanics
Moist Yourself
A quick and easy mod for Riptide users. Upon standing in a cauldron, you gain the "moist" effect, which acts like rain.
Bren-Reforged Unofficial
Port of bren-reforged for NeoForge 1.21.1, with fixes and additional new content.
Exz Enchants
39 unique enchantments for Fabric 1.21–1.21.4, including swords, armor, tools, bows, crossbows, and fishing rods, with custom loot, villagers, structures, and multilingual support.
Hatchable
Automatically hatches eggs or any configured item before they despawn.

Excavation Shovel
Take your mining and digging to the next level with Excavation Tools!
RhythmicLights
Turn music into light shows with this audio-reactive engine. Includes a custom GUI for fine-tuning EQ, loops, and particle effects in real-time.
Eternal Night
This is a Challenge Pack that Makes it Always Night. Can you Survive?
UniversalCauldron
Dye cauldrons with RGB colors, and use them to dye items.
Roll the Dice
Try your luck with new item - dice

Slashbridge
serverside utility mod aiming to add in minecraft commands that I think the base game lacks, bridging datapack and mod function.
SpawnerLoader9000
Loads your spawner even if you're far away.
Record Crafting
A crafting recipe pack that lets you craft Music Discs in a Custom Crafter.
Catter's Enchantment Tweaks
A Vanilla-friendly datapack that improves and rebalances the Vanilla enchantments, without adding any new ones of its own.