Minecraft Java 1.21 Mods
Browse 579 free mods for Minecraft Java 1.21 — popular picks include Create: Dimension, Steamworks Realm, Logical IFrames, WildEncounters [Cobblemon].
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Create: Dimension, Steamworks Realm
Create: Dimension, Steamworks Realm introduces a brand-new mining-focused dimension, designed for automation and large-scale resource extraction. This world is filled with rich veins of ores
Logical IFrames
Reinvents damage invulnerability (AKA red flashing) to be more threatening and challenging.
WildEncounters [Cobblemon]
WildEncounters adds wild grass from the Pokémon games.
Holo Damage Indicator
Adds client-sided, customizable and animated damage indicators when entities take damage/heal.
Moar TNT
Moar TNT adds loads of new creative, crazy, dangerous new TNT to the game. Blow up your friends, mine for diamonds, or flip mobs upside down. So much TNT, with so much potential for fun!

Progressive Archery
A vanilla-style mod that reworks and expands on archery & projectiles, as well as some quality-of-life improvements.
ValhallaMMO
Specifically designed to counter the 2-week gameplay cycle. Keep players active for longer! (Also known from The Realm SMP!)
Origins-Mobs
An Origins Reborn origin addon for PaperMC servers, based on the Mob Origins mod by UltrusBot

Spears, Axes, Swords, Shields, And Other Tools (SASSOT)
A vanilla-style mod that adds Spears, expands on Shields, and reworks melee combat & mining tools.
Sanity: Renewed
Brings the sanity mechanic from Don't Starve into Minecraft
Call Your Cat
Easily call (whistle) your cat with a goat horn to teleport it to you
Origins-Monsters
An Origins Reborn origin addon for PaperMC servers, adding 6 new origins and 4 variants, themed on Minecraft monsters
Cactusfix
🌵 Cactusfix is a mod for FabricMC which provides multiple fixes for cacti.

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?
Useful Snow Golems
Snow Golems do real damage to hostile mobs!
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.
Target Dummy
Craft a target dummy and test your attack damage!
Wandering Illusioner
Wandering Traders have a chance to secretly be a disguised Illusioner
Minecraft Chaos Datapack
Inspired by the GTA Chaos Mod. There are 190 different effects possible in this challenge datapack!
Warning (Horror TBS)
A TBS-inspired mod
Hunted.jar
a minecraft horror mod about a skinwalker.
Armor Restitched
A vanilla-style mod that adds new armour, reworks armour mechanics, and extends on armour trims.
Call Your Parrot
Easily call (whistle) your parrot with a goat horn to teleport it to you
Morphilla
Morphilla is a (vanilla) plugin that makes transforming into a mob possible without any mod!
Custom Starters Menu - Cobblemon
Relive the excitement of choosing your Starter Pokémon just like in the official games, inspired by the iconic Starter Lab!
Journey Into The Light
Journey Into The Light (or "Journey" for short), formally known as Essence of the Gods, is a large exploration mod that not only expands the vanilla content added - but also adds 8 new dimensions, over one hundred mobs, strong weapons and armor, and more
Silent Mobs/Minecarts
Name noisy mobs or minecarts "silent" to silence them!
Sentient Pants
Adds the Sentient Pants leggings enchantment, idea by @eightsidedsquare.
Effective Invisibility
The invisibility status effect turns mobs detection range to 0 no matter the conditions.
Ride My Mon [Cobblemon]
Adds more Pokemon to be rideable in Cobblemon 1.7
Real Peaceful Mode
Realize monsters' expectations, and get along well with them.
Redstone Crusaders TURBO !
A Jojo's Bizarre Adventure mod. Starring Stands with pushed combat and combo potential !
Longshot
Upgrade your ranged combat with enhanced projectile velocity! The archer's 'Strength' potion effect
Particle Expansion
Make the gameplay more satisfying by adding particles to some situations in the game.
Maid's Return
Add lost maid! Now you can fight with these maids.