Minecraft Java 1.21 Mods
Browse 108,514 free mods for Minecraft Java 1.21 — popular picks include CraterLib, YUNG's Better Ocean Monuments (Fabric), Shield Expansion.
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CraterLib
A library mod for First Dark Development and HypherionSA's mods
YUNG's Better Ocean Monuments (Fabric)
A complete redesign of Minecraft's ocean monuments!
Shield Expansion
Adds tiers and parrying to shields for more interesting combat!
Mystical Agriculture Tiered Crystals
Adds Tiered Crystals to Mystical Agriculture.
Universal Grid
Adds a Universal Grid for Refined Storage
Useful Backpacks
Need more slots? Try these backpacks

EMI
A featureful and accessible item and recipe viewer
Additional Lanterns
Additional Lanterns adds many new lanterns with different colors and materials!
Distant Horizons: A Level of Detail mod
Massively increase render distance without harming performance.
Fantasy's Furniture
Adds Fantasy-Themed Furniture & Decorational blocks to the game
Lootr (Fabric)
A mod that makes it so nobody misses out on Loot! All loot chests are instanced per player and visually unique.
Advanced Netherite (Forge / NeoForge)
A configurable, vanilla friendly, open-source mod that adds in more tiers of Netherite!
AeroBlender
AeroBlender is a library mod dependent on TerraBlender, for adding biomes in a simple and compatible manner with Aether's biome/terrain system.
Multi Mine
pause and resume breaking, across players!
Yoyos
Children's toy based weaponry
Accelerated Decay
Speeds up the leaf decaying process
AE2 Import Export Card
Adds an Import & Export Card for Applied Energistics 2
Grass Overhaul (Sod)
More grass approaches. Patches, slabs, stairs, you name it. Neo/Forge/Fabric/QuiltMC
Corpse x Curios API Compat
Adds Curios API support to Corpse
Stylish Effects
Status effect display overhaul: Display them in any menu! And way more compact.
Create: New Age
Create: New Age is an addon for the Create mod that adds integration with electricity.
Ars Additions
An Ars Nouveau addon focused on immersion and quality of life improvements
playerAnimator
animate the player
YUNG's API (NeoForge) [1.20.4-1.21.1 ONLY]
A library mod for some of YUNG's Minecraft mods
NetherEx
NetherEx is a nether content mod.
Abnormals Delight
Fills content gaps and ties together Abnormals mods and Farmer's Delight!
Reap Mod
Harvest crops with right clicking
Configured Defaults
Allows for providing defaults for files absent in .minecraft like configs. A quintessential modpack utility.
TerraBlender (NeoForge)
A library mod for adding biomes in a simple and compatible manner!
Alchemistry
Manipulation of chemical elements, inspired by Minechem

Supplementaries
Vanilla+ additions: Jars, signposts, faucets, weather vanes spring launchers, sconces, planters, lights, decoration and automation
AlchemyLib
AlchemyLib contains shared code for machines and screens. It's used by Alchemistry and other mods.
More Axolotl Variants Mod
Adds more axolotl variants!
Raided
Expands upon the vanilla raid system to allow for more advanced raid mechanics
Tesseract
Tesseract allows you to transport Items, Fluid and Energy
Hearths
A handful of additions to vanilla Nether biomes