Minecraft Java 1.21 Mods
Browse 2,716 free mods for Minecraft Java 1.21 — popular picks include Holo Damage Indicator, Origins-Fantasy, Infuse S1 Revamp.
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Holo Damage Indicator
Adds client-sided, customizable and animated damage indicators when entities take damage/heal.
Origins-Fantasy
An Origins Reborn origin addon for PaperMC servers, adding 10 new origins with a fantasy theme
Infuse S1 Revamp
Infuse S1 Revamp recreational plugin
CobbledLoot [Cobblemon]
A more lightweight version of PokeLoot, featuring small loots that are scattered around the world that give you a reward!
Minecraft but Taking Damage Deletes the Chunk
Taking damage will delete the chunk you are in.
ArmorTweaks
Different armor and damage mechanics that make make survival more suitable for PvP.
Origins-Monsters
An Origins Reborn origin addon for PaperMC servers, adding 6 new origins and 4 variants, themed on Minecraft monsters
Aspects
Aspects is an Origins inspired modification that adds unique Aspects with upsides, downsides and abilities
Call Your Cat
Easily call (whistle) your cat with a goat horn to teleport it to you
All The Totems
A Fabric mod that enables the use of every item as a Totem of Undying
Cobblemon Move Tutor
Adds a Cobblemon NPC for Tutor moves!
Visual Tweaks (Player Customization)
Client-Side mod that allows you to visually customize; Armor Pieces, Damage Flash, Enchantment, Nametags, Hands, & more
Cactusfix
🌵 Cactusfix is a mod for FabricMC which provides multiple fixes for cacti.
Throwable Fire Charges
Adds a new item called the fireball which can be thrown similar to the fireballs in hypixel bedwars.
Freezing Enchantment
New enchantment for swords that's apply slowness to the victims!
Goety: Mastery of Magic Addon
Goety: Mastery of Magic is an addon for Goety that introduces new mechanics, progression options, and additional interactions based on alternative design directions and personal experimentation with the mod’s magic system.

True Survival
True Survival Mode is a comprehensive set of 1.21+ datapack features that aim to overhaul Minecraft's survival mode. It tackles difficulty and progression through means that don't disrupt Minecraft's regular gameplay, while also providing new adventures!
Charged Mobs
Why is only the Charged Creeper affected by lightning?

Simple Damage Indicator
A damage/healing indicators datapack.
Desertification
Adds an "infectious" desert to your world (that will not spawn on its own). This desert can also "cleanse" other infections. Contrary to most infection mods you can live in this desert.
Survival Weather Control
Allows you to summon a thunderstorm using the classic altar used to spawn herobrine!
Useful Snow Golems
Snow Golems do real damage to hostile mobs!
Level Z - Elemental Wizards
A LevelZ Addon for the Elemental Wizards mod.
Dimensional Tears
A revamp of Nether Portal mechanics and End terrain generation
MagicAbilities
A plugin that adds magical powers to minecraft!
Hardcore Revive+ [OLD VERSION]
An add-on to your world that allows you to revive your friends in Hardcore Mode. Discontinued -- Use the new Hardcore Revive+ instead.
HyphaPiracea
Channel the Garden's Rot; Steal the Works of the Worlds; Bridge the Gap
PlayerProgress
PlayerProgress is a Minecraft datapack that introduces a leveling system. Earn UP from activities like mining and combat to level up and gain new abilities and rewards.
Cape Provider X (also PiCapes Mod)
Fork of Cape Provider Mod with upgrades by xsyanic and extended providers (PiCapes, Cosmetica, SkinMC, etc.)
Altar SMP
Legendary weapons plugin for Minecraft 1.21.x Adds powerful legendary weapons with custom textures and abilities to enhance your SMP experience.
Bombs by Juix
Datapack adding a few unique & custom TNTs
Target Dummy
Craft a target dummy and test your attack damage!
Just Boss Swords
Just a mod that lets you borrow the powers of the different boss
Origins Spirits
Adds spirits that rule over fire, water, land, wind, electricity, ice, plants, metal, light, and darkness.
Warning (Horror TBS)
A TBS-inspired mod
Wandering Illusioner
Wandering Traders have a chance to secretly be a disguised Illusioner