Minecraft Java 1.21 Mods
Browse 3,588 free mods for Minecraft Java 1.21 — popular picks include Create:Custom Train Door, Auto Logout, The Ultimate Item Toolkit [1.13-26.3].
Updated daily
Create:Custom Train Door
Interactive CR400BF and CRH2A sliding train doors for Create on Minecraft 1.21.1, with ZIP-based custom textures, animations, sounds, and recipes.
Auto Logout
A mod that automatically kicks yourself from server once a player gets in range of blocks that u set, allows u to afk farm and play safe.
The Ultimate Item Toolkit [1.13-26.3]
Get a Shulker Box with every item in the game using a single command. The perfect toolkit for builders, testers, and creators

NMB. New Models Backport
Mod that makes a layer of compatibility between new models of minecraft 1.21.11+ for the older version. (Backport)
Minecraft Compendium
Uses advancements to log information for the player. Look at mobs with your spyglass to add them to your Mobestiary, and discover biomes and structures!
EntityChunkData
An alternative of Level#getEntitiesOfClass to collect entities.
BlatLibs
Library for the operation of plugins from BlatFan
Piston Packing
Extended functionality for block creation and collection using pistons.
The Mob
Mob Framework | YAML | Boss Phases | Radar HUD | AutoSpawn | Player Stats | 1.21.+
ai-assistant
Adds an in-game AI assistant that answers your questions using Mistral. Use /ask to chat directly from Minecraft.
Hiiragi Core
Library and Utilities mod for Hiiragi's mods
I Want To Control My Server (IWTCMS)
Simple minecraft mod, which allows you to connect to your server and control it
Virtual Motion Capture
Gives your Minecraft client the power to send VMC protocol data for vtuber models.
All Items (Server Mod)
Track a groups collective progress for an all items challenge
Tom's Loot
This modpack adds a variety of loot tables and can be used by other mod developers for structure mods and other mods with loot tables as a basis.
LuckyTools - Lucky Drops
This is the Best Mod for each easy Lucky Drops from Mobs and Blocks, Fabric API (Req)
APEL
Apel stands for Animative Particle Engine Library and is used for complex particle animations, all without the need to major in linear algebra. It provides a straightforward interface and rich in documentation for developers.
Sandbox Cutscenes
A library mod to make cutscenes for your mods, maps or modpacks
Entity Custom Data
Enable the custom data of entities by the DATAPACK.
ChristCraft
Removes magic and spiritism where possible.
Packdev Toolkit
A collection of developer tools for building modpacks and datapacks. Pull textures/models out of resource packs, dump lang entries, search datapacks, and copy item IDs: all without leaving the game!
debug-helper
a Minecraft Fabric api that helps debug
Vereya
python api for minecraft
Mentalitys | Custom Enchants
Custom fabric enchantments for 1.20.1, 1.21.1 & 1.21.11.
BlossomBridge API
A small API for Tywrap Studios Mods, that adds a few minor things.
RevertRaidChanges-Extra-BadOmen
allows you to obtain BadOmen after killing raid captain, just like before version 1.21.
MCio
Minecraft Input/Output
SharedInventoryLink
SharedInventoryLink is a Paper plugin that links inventories between players in real-time. Players in the same group always share the same items — hotbar, armor, and off-hand. It includes anti-death duplication, join sync
Coleus
Addon for Lavender that allows guidebooks to be viewed in a web browser
kts-system
Client bank system for minecraft servers Client side mod for create ecosystem on private minecraft servers
Tsrheang Xray
Xray mod with versatile functions
E-lib
The local library for Forge modifications
HighMod
HighMod is a early mod which adds custom dimensions , items, blocks, armour, custom entities and more! It doesn't require GeckoLib to load custom entities
Book Edit: Vanilla book editor
A spigot plugin that allows a player to add colors and effects to texts in books in vanilla
MCAnim
A library for display entity animation in Minecraft
Slayer Quests
Serverside mod that allows Nitwits to assign OSRS slayer style quests, also works as a library for adding quest functionality to your own mobs