Minecraft Java 1.21 Mods
Browse 157 free mods for Minecraft Java 1.21 — popular picks include Cupboard, Iceberg [Neo/Forge], ZeroCore 2.
Updated daily
Cupboard
Cupboard provides code, frameworks, and utilities for minecraft mods
Iceberg [Neo/Forge]
A modding library that contains new events, helpers, and utilities to make modder's lives easier.
ZeroCore 2
Utility mod and multiblock API
InsaneLib
A set of common classes and utilities used by Insane's mods
Roughly Enough Items Fabric/Forge/NeoForge (REI)
Clean and Customizable. An easy way to browse recipes. Alternative to JEI Just Enough Items.
Kotlin for Forge
Adds a Kotlin language loader and provides some optional utilities.
EMI
Featureful and accessible modern item and recipe viewer with JEI compatibility
Iceberg [Fabric]
A modding library that contains new events, helpers, and utilities to make modder's lives easier.
LibrarianLib
An extensive collection of tools, utilities, and frameworks.

EMI
A featureful and accessible item and recipe viewer
Create: Dragons Plus
Provide convenient features to players and dev utilities for Create addon developers.
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
Data Anchor
Simple library mod with helpful data attaching and networking utilities including attaching data to entities, chunks, players, and worlds with low boilerplate code. Its own system built from the ground up for multiloader support.
ObsidianUI
SpruceUI unofficial forge port, is a Minecraft mod API which adds some GUI utilities.
Kube Utils
Adds helper utilities and new features to KubeJS in a clean, concise and consistent API design
FDLib
Collection of utilities for my mods
Cobblemon Counter
A utility mod that keeps track of Cobblemon wild KO/capture counts/streaks.
BBL Core
Various useful methods, utilities and helpers to make coding mods a bit better
Lazr's Lib
A library containing many utilities for Lazr's Mods.
Enchant Limiter (RPG Tweaks)
Limit the number of enchantments on an item.
Lazy Utilities [Deprecated]
My little Toolbox for my mods
WunderLib
A Library Mod that simplifies Configs with an automated UI, Grid-Based UI-Layouts, Simplified Network management and other usefull utilities.

Petrolpark's Library
A library of shared features and utilities for my mods
CthuLib
Core utility mod for Pixel Dream Studios modpacks
Mebahel's API
Mebahel’s API is a core dependency mod that provides shared systems, utilities, and gameplay frameworks used across the Mebahel mod ecosystem.
BCLib: New Dawn
An unofficially maintained continuation of BCLib for Fabric and NeoForge, providing core utilities and shared functionality for BetterX mods
WunderLib: New Dawn
An unofficially maintained continuation of WunderLib for Fabric and NeoForge, providing automated configuration screens, grid-based UI layouts, simplified networking, and other utilities used by BetterX mods
Hud Compass
Shows a compass at the top of the screen with waypoints
AnCore Lib
AnCore is the essential library for Anchor Studios mods; offering utilities, custom GUI components and helper functions designed to enhance and support our modding projects.
SL Library
Adds various base utilities, synchronization help, policy, packet sending and data driven
SLM: Epic Fight
Add utilities to create passive skills, innate skills, and implement events in Skills for Epic Fight; model, registry & sync utilities.
LYIVX's Core
Mod Utilities For My Mods Not Useful For Anyone Else.
Void Lib
A lib that adds various utilities to mod development
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.
SolLib
Lets mods shine by bringing a constellation of (mostly) data utilities.