Minecraft Java 1.21 Mods
Browse 3,576 free mods for Minecraft Java 1.21 — popular picks include Void Lib, ShiftedLib, Modern Networking.
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Void Lib
A lib that adds various utilities to mod development
ShiftedLib
My personal library that used by my mods.
Modern Networking
Multiversioned and multiloader network packet API based on 1.20.6+'s method of packets.
Modulation
A growing collection of quality-of-life tweaks, bug fixes, and cross-mod integrations for modpack creators!
NightCore
A lightweight library with a wide range of utilities and tools for faster and more efficient plugin development.
Unknown5473lib
A universal code library prerequisite for mods created by Unknown5473,Provides a Boss mob template library and screen effects..
MomentariyModder'Applications
Core for MomentariyModder mods.
Zigy's Player Animator API
API for playing player animations from server side.
Strut Your Stuff (Library)
Library used for spanning blocks, features collisions, interactions and so on in an accessible and reusable library.
S-Lib
A core utility library providing shared code for Stalemated's mods.
KubeJS Diesel Generators
Create: Diesel Generators integration for KubeJS
SolLib
Lets mods shine by bringing a constellation of (mostly) data utilities.
Flight API
A simple, zero-dependency API for flight controlling and detecting mods that break flight.
Custom Tooltip API
Data-driven tooltip text creation.
Apothecary - Potion Expansion
A potion expansion with a large variety of different effects!
Prometheus
🔥 Backbone of modded fire 🔥

Sketch
A library for Team Abode's mods.
Player2 AI NPC
This is not just another companion mod; it is a live showcase of the PlayerEngine framework, built to fundamentally change our perception of AI NPCs in Minecraft.
COLib
Commonly used Ores
[Discontinued] ChassisCore
Core for creating exoskeleton armor
Skniro's Furniture
Skniro's furniture mod introduces a wide range of furniture while keeping the original Minecraft aesthetic.
HutosLib
A Library Mod
Craftable Elytra [Remastered]
A not official 1.16+ version of craftable elytra mod from shmeggels
Night Auto Config
Serialize everything! Night Config integration for Auto Config.
GooeyLibs
A user-interface based library useful for creating front-end UIs for existing game screens on both Forge and Fabric
Moff's AddonAPI-DynLoad
A library mod that provides an API for dynamically loading objects in addon mods based on the mods loaded by Forge.
Integrated REST
Expose Integrated Dynamics networks as a REST API
Ars Sable
A compatibility mod for Ars Nouveau and Sable sublevels.
Just Utilities
A personal use Multiloader Library
BBL Fixes
Contains some fixes to mods and mod interactions
No More Useless Keys - NMUK (Fabric)
Allows you to add alternative key combinations to every key binding!
Modern UI mVUS
UNOFFICIAL Fork of ModernUI-MC to add minor version update support.
pv-addon-soundphysics
Compatibility add-on for Plasmo Voice and Sound Physics Remastered mod. With this add-on Plasmo Voice will be affected by Sound Physics.
Easy CraftTweaker
Gui for Craft Tweaker that allows you manage your recipes with ease.
Better Combat Extension
Extends the mod 'Better Combat' with additional functionality.
Potion Core Reborn
Revives Potion Core and bring it to modern versions