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Minecraft Java 1.21 Mods

Browse 3,577 free mods for Minecraft Java 1.21 — popular picks include Untitled Duck Mod (Forge), GTBC's SpellLib/API, Amecs (Fabric).

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Untitled Duck Mod (Forge)
1.21.1neoforge

Untitled Duck Mod (Forge)

Ducks for Forge and Fabric! Powered by geckolib and architectury.

7.6Mdownloads
GTBC's SpellLib/API
1.21.1neoforge

GTBC's SpellLib/API

A library mod and common code storage for all of my mods containing helpful tools to make my life easier with ISS add-on making!

7.5Mdownloads
Amecs (Fabric)
1.21.9fabric

Amecs (Fabric)

Improves your keys & controls setup by providing modifier keys and making multi-functional keys a thing.

7.5Mdownloads
UnionLib
1.21neoforge

UnionLib

A library mod for all my mods

7.4Mdownloads
Caelus API
1.21.4neoforge

Caelus API

A coremod and API to provide developers access to elytra flight mechanics through an entity attribute.

7.3Mdownloads
Cobblemon Tim Core
1.21.1neoforge

Cobblemon Tim Core

What if my Cobblemon mods worked without a bunch of copy/pasting?

7.2Mdownloads
[Let's Do Addon] EMI Compat
1.21.1neoforge

[Let's Do Addon] EMI Compat

EMI compat with all of the Let's do series

7.2Mdownloads
Configuration
1.21.11neoforge

Configuration

Configuration library for easy config management

7.2Mdownloads
Guidebook
1.21neoforge

Guidebook

Custom books with formatting and pictures

7.2Mdownloads
Configurable
1.21.11fabric

Configurable

Config library that allows decentralised settings in a mod

7.1Mdownloads
Blueprint
1.21.1neoforge

Blueprint

Library that implements the framework of all Abnormals mods!

7.1Mdownloads
Oh The Trees You'll Grow
1.21.11neoforge

Oh The Trees You'll Grow

Tree library used by popular mods such as Oh The Biomes You'll Go.

7.1Mdownloads
Kambrik
1.21.1neoforge

Kambrik

A Kotlin Library Mod

7.1Mdownloads
Lexiconfig
1.21neoforge

Lexiconfig

This is a config API that aims to provide many integrations alongside other libraries, and to be as easy as possible to use, for both developers and users alike.

7.0Mdownloads
More RPG Library
1.20.1fabric

More RPG Library

Library with status effects, entity attributes & Spell engine API additions.

6.9Mdownloads
Loading Backgrounds
1.21.4neoforge

Loading Backgrounds

Customize the loading background of the games, and place customizable images.

6.8Mdownloads
[Deprecated] Trinkets Compat Layer for Accessories
1.21.1fabric

[Deprecated] Trinkets Compat Layer for Accessories

A Compatibility layer for mods using the Trinkets API to work with Accessories

6.7Mdownloads
Dynamic Asset Generator
1.21.1neoforge

Dynamic Asset Generator

Library mod for dynamically generating assets at runtime.

6.6Mdownloads
Create: Liquid Fuel
1.21.1neoforge

Create: Liquid Fuel

Pump in liquid fuel to blaze burners

6.6Mdownloads
Deltabox Lib
1.21.1fabric

Deltabox Lib

A Kotlin library for all Deltabox mods!

6.4Mdownloads
Fragmentum [Forge Edition]
1.20.1forge

Fragmentum [Forge Edition]

The lightweight framework for the Obscuria Collection multi-loader mods

6.4Mdownloads
Every Compat (Wood Good)
1.21.1neoforge

Every Compat (Wood Good)

Universal Wood Compat: Quark, Twilight Forest, Twigs, Another Furniture, Farmers Delight, Macaw's, Valhelsia, Architects Palette, Deco Blocks, Crayfish FM

6.3Mdownloads
Foolproof
1.20.1fabric

Foolproof

Utility for modpack devs that fixes commonly reported areas of user confusion

6.2Mdownloads
KubeJS Additions
1.21neoforge

KubeJS Additions

[NEW] Custom JEI Categories & Jade Integration

6.1Mdownloads
Accessories Compatibility Layer
1.21.1fabric

Accessories Compatibility Layer

Modifies commonly used Accessory API's to work with Accessories, unifying a modpack under one Accessory API

6.1Mdownloads
Restricted Portals
1.21.11fabric

Restricted Portals

A mod that requires the obtainment of an item before allowing the player to enter a dimension.

6.1Mdownloads
MaFgLib
1.21.11neoforge

MaFgLib

MaLiLib unofficial forge port. Library mod for the Forge port of masa's mods.

6.0Mdownloads
StartInv | Seconds of Immortality!
1.21neoforge

StartInv | Seconds of Immortality!

You will start with a few seconds of immortality! You will never start dying again

6.0Mdownloads
AutoMessage
1.21.9fabric

AutoMessage

Now you can send automatic messages at any time during the game!

5.9Mdownloads
Library Ferret
1.21.11forge

Library Ferret

Shared code for the mod of jtorleon studios

5.8Mdownloads
Omega Config
1.21.1neoforge

Omega Config

Simple & lightweight configuration library for Fabric

5.5Mdownloads
GPUBooster
1.21fabric

GPUBooster

Provides DSA & fastest math formulas to game render system for best perfomance! Compatible with Sodium/Embeddium, Iris and shaders.

5.5Mdownloads
TCT Core
1.21.8neoforge

TCT Core

This mod allows you to centralize all the other mods in order to be able to access the information or settings directly in the game

5.5Mdownloads
Revelationary
1.21.1fabric

Revelationary

Data Driven Block and Item Revelation system. Discover as you go!

5.4Mdownloads
WTHIT Forge Edition
1.21.11neoforge

WTHIT Forge Edition

Forge version of WTHIT, a fork of Hwyla which is a fork of Waila.

5.4Mdownloads
Differentiate
1.21.1neoforge

Differentiate

A modding library for Eltrut & Co.

5.2Mdownloads