Minecraft Java 1.21 Mods
Browse 268 free mods for Minecraft Java 1.21 — popular picks include Mob Brain Additions, NxControl, QinhCoreLib.
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Mob Brain Additions
This API can be used by other mods to give additional functionality to mobs that use the brain system.
NxControl
NxControl is an advanced staff plugin that lets OP players control players or mobs using simple keybinds, with GUI, bossbars, and freeze system built-in. It’s lightweight, powerful, and perfect for moderation, trolling, or cinematic gameplay.
QinhCoreLib
Shared core library for the Qinh plugin suite. Unifies item sources (CraftEngine, ItemsAdder, Nexo, MMOItems, MythicMobs & more), attributes, custom-block & model bridges, and scripting. Required by QinhItems, QinhSkills, and other Qinh plugins.
RTN's Economy Library
Server-side economy library with rewards for killing mobs, kill combos, top lists and a developer API. Vault-style economy for mods in Minecraft.
Custom Entity API
A datapack API allowing anyone to add custom entities, or bosses, to Minecraft: Java Edition, powered by Animated Java.
Proprietary Teams Bridge
Mod to bridge Priopetary Teams mod to FOSS alteanatives
Pixel Combat
Pixel Combat is a professional, zero-dependency PvP combat plugin built for competitive Paper 1.21 servers.
Two-Dimensional Foil
A mod that adds a two-dimensional foil weapon from The Three-Body Problem. Drop it to collapse blocks and creatures into an irreversible, mirror-like 2D plane within a configurable radius. Requires Fabric API.
ephemeral_beacon by only5117 1.21x
Ephemeral Beacon is a rare block that cosmetically transforms neutral mobs within a 50 block radius over three in-game days. It creates permanent unique color variations like lavender sheep or gold striped pigs adding subtle magic to your world.
Spell Utils Mod (1.21.1) – Library for Iron's Spells and Spellbooks Addons
Spell Utils Mod is a utility API designed to help developers create addons for Iron's Spells and Spellbooks Mod. It provides ready-to-use systems, classes, and tools that simplify the process of building custom spells, mobs, and bosses. This mod is mainly intended for mod developers, not regular players. Features: Mob & Boss Systems Custom spellcasting […]
Travelers Lib Mod (1.21.1, 1.20.1) – Library for Collinvht's Mods
Travelers Lib Mod is a technical support library used by Collinvht to build animal and creature-focused Minecraft mods. It does not add gameplay content by itself, but provides systems and tools required by other mods. Features: Core library for creature and animal-based mods Animal attribute system for easier creature setup Simplified and structured animal registration Async […]
Chrysalis Mod (1.21.4, 1.21.1) – A Framework to Customize Game Mechanics
Chrysalis Mod is a library that other mods need to work correctly. You usually only need to install it when another mod lists it as a requirement. This mod provides a shared set of tools and features, like systems for camera shakes, custom music in structures, and a way to pick up mobs in buckets. […]
Sketch Mod (1.21.1, 1.20.6) – Unlocks Custom Boats and Animations
Sketch Mod provides a collection of tools and APIs for other mods to use. As a library mod, it helps with creating things like custom configuration files and new animations for mobs. The mod also adds special events for shield blocking and a system for making new boat types. Features: Config API: Gives other mods […]
Temporal API Mod (1.21.4, 1.20.1) – Makes Other Great Mods Work
Temporal API Mod provides a framework to make creating other Minecraft mods easier and more flexible. This mod does not add new gameplay features for players directly. Instead, it is a library that helps other mods work by reducing repetitive code and simplifying the development process. Features: Provides object factories to help create new game […]
Dio's Lib Mod (1.21.8, 1.20.1) – Library for Janoeo's Projects
Dio's Lib Mod is a lib mod who add a lot a utility thing for the mod of Janoeo's Projects. Features: General use data generator Block helper like: Mobs anger Access to specific block function New functionality to snow powder Custom config file system utilising json And another utility function like RessourceLocation helper and more. […]
Light Level 2025 Mod (1.21.8, 1.21.5) – See Light Levels Above Every Block
Light Level 2025 Mod displays the block light level directly above solid blocks-allowing players to instantly assess mob-spawning risks visually. Inspired by Parzivail’s legacy LightLevel mod, it introduces improved performance, modern color rules, and convenient configuration. Features: Press F9 to see the block light levels Screenshots: Requires: Fabric API Light Level 2025 Mod Download Links […]
Kleiders Custom Renderer API Mod (1.21.1, 1.20.1) – Change The Player/Mobs Models
Kleiders Custom Renderer API Mod is a technical library created by the modder kleiders3010. It provides functions for altering the player’s appearance, primarily used in their own mods-but it’s also been adopted by other developers for similar purposes. Loaded on demand by: Create protection pixel mod – this means the API is only activated when […]
Petrolpark's Library Mod (1.21.1, 1.20.1) – Offers Useful Tools For Development
Petrolpark's Library Mod supports mod that provides shared features used by other Create-based mods from the same author. It offers tools that help development and interaction. Features: Adds “contaminants” that can affect recipes and items. Supports items that decay or change over time. Includes custom crafting options like aging recipes and manual-only crafting. Adds early […]
Satin API Mod (1.21.4, 1.20.1) – Help Modders with Shader Usage
Satin API Mod is a simple library allowing modders to add interesting graphical effects to their mods. Its main feature is to significantly simplify the use of Minecraft's data-driven shader system (that is, the one used by super secret settings, mob vision, and spectral arrows). It is a lightweight library for OpenGL shader usage. Features: […]
BjornLib Mod (1.21.1, 1.20.1) – Core Library For Mob And Effects
BjornLib Mod is a core library mod by FuriusMaximus, providing shared functionality for several of their mods, such as Dragon Mounts: More Dragons. It includes useful utilities and systems designed to streamline gameplay enhancements. Features: Ability Registry and custom ability events Particle Builder with magic-style glowing effects Lightning Builder for custom lightning visuals Leveling Builder […]
TheDragonLib Mod (1.21.1, 1.20.1) – Library for TheDragonTeam's Mods
TheDragonLib Mod is a mod that provides utils essential and Functionality for most of the other TheDragonTeam's Mods, It is also a mod needed for some other mods as a core mod. Some mods require this library to run, for example: ArmorPlus, Mob Settings, Custom Crafting Tables, Environmental Grimoires, UsefulRecipes, and possibly some others. TheDragonLib […]
Hostile Neural Networks Mod (1.21.1, 1.20.1) – Create a Digital Mob Farm
Hostile Neural Networks lets you get mob drops without fighting. You can train data models of different mobs and then run simulations. These simulations create predictions that can be turned into a mob's loot. Features: Create Data Models by using a Data Model Framework on any target mob. Train your Data Models inside a Deep […]
EntityJS Mod (1.21.1, 1.20.1) – Script Smarter Mobs
EntityJS Mod is a powerful addon for KubeJS that enables modders to define and control custom entities using JavaScript. It offers a flexible framework for scripting entity behaviors, attributes, AI, and animations, streamlining the modding process for Minecraft Features: Easily register custom entities and define their attributes and behaviors using JavaScript. Modify existing entity methods […]
ManyIdeas Core Mod (1.21.1, 1.20.1) – Unleash Your Creativity With Infinite Possibilities
For Minecraft aficionados who have an insatiable appetite for creativity, the ManyIdeas Core Mod is a game-changer. It serves as the foundational cornerstone for a suite of mods that collectively introduce a treasure trove of new elements to your Minecraft world. Let's dive into what this extraordinary core brings to the table. Embrace the spectrum […]
Paucal API Mod (1.21.1, 1.20.1) – A Link between Mods
Paucal API Mod is a library Mod that places significant emphasis on bridging famous Petrak's Mods, allowing them to be compatible with each other. Paucal mainly serves as a backend for Petrak's Mods, thus providing players a better experience. At the same time, players get to utilize useful backend utilities to make their gameplay more […]
Better Runtime Resource Pack Mod (1.21.1, 1.20.1) – Smart Resource Management
Better Runtime Resource Pack Mod is a library mod used to generate resources during gameplay. It’s actually a branch of the Advanced Runtime Resource Pack (ARRP) mod. What is a runtime resource pack? Runtime resource pack (RRP) refers to asset and data files generated when Minecraft is running, in avoidance of some repetitive works. For […]
ovenlib
Library for Polymerized Bakery, handles alot of repetition in our development and you might find it useful as well!
ExtraHitboxes
Add extra hitboxes from geckolib and blockbench
QuickWhisper
A terrifying Minecraft horror mod made on NeoForge that adds procedural jumpscares, creepy ambient sounds, and an immersive custom glitch menu.
Modpack of Redstone
That's a useful thing;It includes essential helpers like Carpet and Tweakeroo, along with various optimization mods and resource packs.
Gravitation
Easily change the world's gravity
Dolphin's SpearSmp plugin
This plugin is a remake of Dolphin's SpearSmp plugin.
Petrolpark Library
Shared code for my mods
hidename(nick) and Player health show and (Nick Change)-Hidden Name
"Hide player names on the server or client" //PLAYER HEALTH, Nick Change, item name, mob health, and player health.
Randomizer Ultimate Core
The core mod for one of my modpacks, random block drops, mob drops, and loot container loot
Mob Controller Creeper Spawning
This Mod adds control functions for Creeper Spawning in Minecraft, creating a variety of internal alternatives, reducing the appearance of said mob by 75%, 50% and 25% (at the player's choice) compatibility for 1.17 to 26.1.2