Minecraft Java 1.21 Mods
Browse 108,801 free mods for Minecraft Java 1.21 — popular picks include Deimos Lib, Amplified Nether, Farmer's Knives.
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Deimos Lib
Config and datagen library based on midnight lib
Amplified Nether
256-tall nether with 3D biomes, mountains and more!
Farmer's Knives
Adds knives to Farmer's Delight Fabric for many other mods
Create Ore Excavation
Extract resources using machines powered by Rotational Force
Jaden's Nether Expansion
Nether Expansion is a Vanilla Friendly mod that aims to improve & add new content to every aspect of The Nether
Prefab
Creates ways of providing instant structures
YUNG's Better Mineshafts (NeoForge)
A long-awaited and much-needed abandoned mineshaft overhaul!
YUNG's Better Jungle Temples (Fabric)
A complete redesign of Minecraft's jungle temples!
Advanced Finders
Discover ores faster with new finders that revolutionize the mining experience
[FABRIC/QUILT] Disable Custom Worlds Advice
Minecraft asking you if you want to load a custom world is annoying. Let's fix it!
Aether Addon: Enhanced Extinguishing
Improves the consistency of fire being disallowed in the Aether by adding new extinguished variants of blocks.
Xtones Reworked
Port of the Mod Xtones that adds various of modern, futuristic, and fantasy style decorative building blocks
Useful Railroads
Wo don't want extreme high speed rails for travel?
Chunk Loaders
Chunk Loaders allows you keep chunks loaded with different tiers of chunk loaders!
YDM's MobHealthBar
Health Bar above mobs
Dyenamics
Contains various pigment options for colorful gameplay!
Elysium API
Elysium is a library mod with various utilities, built-in features and new data driven systems for both Mod-Developers and Modpack-Creators to utilize
Roughly Enough Professions (REP)
An REI addon that adds profession workstations
Wizards (RPG Series)
🧙🏻♂️ Destroy your enemies with Arcane, Fire and Frost magic
YUNG's Better Strongholds (NeoForge) [1.20.4 - 1.21.1 ONLY]
A complete redesign of Minecraft's strongholds
ChemLib
Items for all periodic elements and many chemical compounds
Everything is Copper
Some actual uses for copper. Adds a copper version of all the iron blocks and items.
PlayerRevive
Revive your friends

Amendments
Many changes to vanilla blocks
Cultural Delights
A Farmer's Delight addon that adds food systems from around the world.

Sodium Dynamic Lights
Multiloader port of LambDynLights that adds Sodium options integration
Chef's Delight [Fabric] - Farmer's Delight Villagers
Add-on for the Farmer's Delight mod. Adds 2 new professions to villagers.
The Pixelmon Mod OST
The Offical Pixelmon Mod OST by Chris Geddes
Fast Item Frames
Supercharged item frames! Less lag, better performance, and now they can change color and vanish!
Backpacked Recipe Fix
Replaces Backpacked mod backpack recipe
Factory Blocks [Forge/Fabric/NeoForge]
Addon to Chisel Refabricated's Blocks to add Factory Blocks
Better Tridents
You didn’t know your trident could do that! A crafting recipe, better loyalty, and more!
Tesseract API (NeoForge)
Another library mod for mod developers
EMI Enchanting
EMI Plugin that gives basic enchantment information; valid items, exlcusions, etc.
Illagers Wear Armor
Allows Illagers to wear armor!
Architect's Palette
A host of new blocks to build and tinker with!