Minecraft Java 1.21 Mods
Browse 2,270 free mods for Minecraft Java 1.21 — popular picks include Quacky's Whacky Inven, Ultimate Step, LavaDamage.
Updated daily
Quacky's Whacky Inven
Want a weird inventory UI? Just use this, you can customise each slot of your inventory to be wherever. Most likely allowed on PVP servers as its only a UI change :)
Ultimate Step
UltimateStep is an all-in-one Paper server management plugin featuring a powerful rank system, configurable scoreboard, customizable tablist, and complete punishment tools including warn, mute, ban, kick, unmute, and unban. Lightweight, modern, and easy
LavaDamage
Take damage when standing too close to lava.
TnT explodes on Ground
This data pack makes it impossible for tnt to explode while falling, it will only start its cooldown when it lands
Mystic Pulse
This datapack adds drums to the game and when you play them in a specific pattern it can give you effects

dupe_hack (April Fools)
Adds minecraft:dupe_hack from the April Fools 'Voting Update', with some changes.
Egg mod
Plays funny custom sounds whenever your eggs or snowballs hit another player. Client-side, works everywhere!
More Functional Storage Upgrades for ExNihilo
Addon for More Functional Storage Upgrades to support ExNihilo blocks
MagicFactory
Mod adding a new liminal space
Rule Breaker's Guide
Breaking open Minecraft for those who seek more in survival.
LFT
Replaces vanilla Nether Portal activation with a cinematic story event
Admin Backdoor
This simple Paper plugin adds a new way to enter Operator mode
Somewhat Warm
Super Hot in Minecraft
AntiHaram
Unserious mod that adds a haram counter that increases if you do haram and decreases if you do halal, with a cool judgement day system & dimension
Rememberence.jar
This is the revival of Lifeless.jar. Play it of you Dare One Player only!

InfiniteRain
Lightweight data pack to make it infinitely rain in your world/server upon load.
Pigstep In Fortresses
Where did it go?! Adds the Pigsteo Music Disc to the fortress chest loot table!

Center of the World
Makes all mobs know your location at all times
Helpful Tips
The server randomly sends you mostly unhelpful tips.
/Giftheart
Use /gifth to gift a player a heart No rights reserved
QuantumCraft
Each player sees their own version of the world
Pesticides
Adds pesticides to the game to make your farming experience worse ! (or to poison your friends)
More Bounce
This mod adds many new bouncy balls to minecraft for example the house ball spawns a ball wherever it lands its a fun goofy mod that you can add to your sever for more fun. This mod is to help minecraft on expanding there balls for not just having snowbal
GreetCraft
A powerful and configurable Paper Server plugin that greets players with beautiful, formatted messages when they enter the server.
Stannum
Creates a client-side ambient effect using customizable particles, radius, and count
Common-Fish
Tropical fish Advancements - Fish goes weeeeeeeeeeeee
PurgeSMP
If one player dies, every player dies.
PintoTools
A plugin to add simple item-based editing commands
ChunkMix
Every chunk - New biome! Spice up your world!
Simply Troll
A lightweight plugin, that let you troll your friends

AllMaterialsAllowed
This is a mod based on the image meme of Minecraft streamers locking in to craft things that don't actually exist in the game. Basically, it allows you to craft a large assortment of items using any material.
Concept
Adds various chaotic features that were suggested to me!
Nerfed Elder Guardian
Small mod that lowers elder guardians radius for giving a player mining fatigue from 50 to 10 blocks
More Items Dynamic Lights
Adds a few more items to the dynamic items datapack by CreepermeYT
Transmitter Pearl
Have you ever wanted the ability to swap the position of 2 mobs with one simple device?
Anvil Restoration Recipe
This data pack allows you to get iron ingots from damaged or chipped anvils as a crafting recipe (Chipped = 22 Ingots, Damaged = 14 Ingots)