Minecraft Java 1.21 Mods
Browse 268 free mods for Minecraft Java 1.21 — popular picks include Poofy's Uncraftable Recipes+, PyCraft IDE, TQs Unstack Shulkers in item form.
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Poofy's Uncraftable Recipes+
This mod adds over 280+ crafting recipes to vanilla Minecraft!
PyCraft IDE
An in-game Python IDE for Minecraft that allows scripting and interaction with the game through a Python API.
TQs Unstack Shulkers in item form
Unstacks stacked shulker boxes that are in item form. Handy with mods that can stack shulker boxes in your inventory and on the ground, like tweakeroo and carpet mod.
Mathimations
A lightweight Minecraft animation library for creating smooth, math-based entity animations without keyframes.
Turne off arrow
Removes arrows fired by non-players when colliding with a block or entity.
SentienceEntity
A powerful Minecraft plugin that adds interactive NPCs with advanced features to your Minecraft server
CorruptionCraft
A plugin that challenges players. Random events can occur. (no Spoilers!)

Slime Tweaker
Small mod that adds a gamerule and config to change the size of spawned slimes.

Chickens Lay Anything
Configure what items chickens lay using loot tables!
Wardens drop OP loot
This datapack makes wardens drop over-powered loot
Cobbliki REI
A client-side REI (Roughly Enough Items) integration for Cobblemon. It turns the REI panel into a Pokédex of game data.
EnchantedBosses [Free]
An endlessly customisable bosses plugin using SkillsLibrary
Weights
A simple mod for entities, to have Weight and Mod Weight Library
Brea Nonatomic
A mod provides operator system which can create entities to follow and help you.
Tameable Bees — Ручные Пчёлы
Tameable bee. Follows you, protects you, and collects pollen. A new companion on your adventure
EditVillagers Plugin
The easiest way to create a Trader in Minecraft!
Better Mannequins
Making Mannequins Better for your DataPack dev Convenience!
ADKM
Defeat a powerful, giant boss roaming your world to claim his legendary Scythe with +16 Attack Damage! A high-risk, high-reward challenge. (Requires GeckoLib)
Art's CLA (NLAM)
A datapack that allows chickens to lay anything with some restrictions to reduce abuse and server lag. Based on helmo2019's Chickens Lay Anything.

Client Entities Lib
Library for creating and managing client-side entities
euclidia
Adds Neural Network Powered Epic Fight Mob Combat

OGDuels
OGDuels is a lightweight, high-performance Duels, FFA, killstreak, bounty, and leaderboard module designed for competitive Minecraft PvP servers.
PNode
Paper plugin with intuitive visual node-based editor for server logic. No coding required.
Villager Sound Changer
This mod allows you to press F7 to open a menu where you can customize villager sounds to your preference. HOTKEYS: F7 opens the menu.
SoItsPlushies
A small mod I made for plushies of me and friends!
Custom Boss Zoryth AI
Zoryth AI Boss is a premium, high-performance custom boss framework for Paper (1.21.x).
mannequin controlls
mannequin controlls allows you to move/pose mannequin easily and can be used as a mini library for a variety fo projects.
Vitae
Vitae is a data-driven entity framework for NeoForge 1.21.1 that lets you define custom animated mobs, bosses, and NPCs through datapacks and optional KubeJS scripting.
GLB lib
A library mod that allows for glb 3d models to be used for minecraft entities
Void Pressure
A flexible NeoForge framework for modpacks, providing a global pressure system to trigger fully configurable events.
Giant Attribute Tweak
Changes the Giant Mob attribute to make it compatible with mods that adds IA
Snippet
The ultimate screenshot upgrade for Minecraft. Browse, edit, and share instantly - soon featuring toggleable layers.
Armor Resistance
A Balanced PvP Oriented Mod That Adds A New Attribute To Netherite Armor!
twinkle popo mod
it adds twinkle popo realistic pikachu and realistic hellokity
Chorus Fruit - Spawn
Changes the behavior of chorus fruit to teleport you to your bed/spawn. Also teleports any mobs attached to your lead!
LiveJava
a VS Code-powered Web IDE that lets you build multi-class, hot-swappable native Java plugins instantly with zero reloads and automatic dependency injection.