Minecraft Java 1.21 Mods
Browse 531 free mods for Minecraft Java 1.21 — popular picks include KNLibs, Pixel Combat, Item Challenge.
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KNLibs
KNLibs is a lightweight, high-performance core library required for all KN Projects plugins.
Pixel Combat
Pixel Combat is a professional, zero-dependency PvP combat plugin built for competitive Paper 1.21 servers.
Item Challenge
Give your server a collective goal: collect a set amount of any item before the in-game days run out. Track progress in real time through a boss bar, deposit your items in one command, and see who contributed the most.
Neuro Anticheat
Lightweight and practical anti-cheat plugin for Purpur/Paper 1.21.8.Designed for SMP servers that need a simple, configurable baseline protection without heavy setup.
SpyHITW-Mod
A client side dependency mod, to render walls of hole in the wall and calculate physics.
Jobsy AutoDiscordLinker
JobsyDiscord is a lightweight Paper 1.21.x plugin that promotes your Discord server by sending automatic clickable chat broadcasts every 30 minutes. Players can click the message to instantly join your Discord, while Bedrock players (via Geyser/Floodgate)
NzxterMOTD
This is the best and most perfect motd system for Bukkit
DialogAuthVelocity
Velocity addon for DialogAuth for premium accounts support
MapCycle
MapCycle makes managing rotating FFA maps simple by handling everything automatically while keeping full control available for administrators.
CC: Wasm (Unofficial port)
Adding Wasm to CC: Tweaked (1.21.1 NeoForge port)
Plugin Manager Plus
A lightweight and powerful tool that allows server administrators to load, unload, reload, enable, and disable Minecraft plugins dynamically at runtime without restarting the server.
KKAiHelper
AI Customer Support | Typewriter Effect | Agent Auto Rules
Relocation
A simple building relocation plugin
PluginListPlus
A more readable plugin list with customizable aesthetic themes and styles.
UltraTrackStats
UltraTrackStats is a Bukkit/Spigot plugin that provides a centralized player statistics tracking system (kills, blocks, and more) accessible by any plugin via a simple public API.
Kore: Kotlin framework
A modding framework to enhance your Kotlin modding experience. Create mods the Kotlin-way!
Aevum
Create, manage, and track timers with ease. ⌛
KotlinScriptLoader
It’s a script-based project—you can write your own scripts using full-fledged Kotlin! You can even create your own API and build add-ons! It’s got absolutely everything!
Metrognome
Plays MIDI files on the in-game instruments from the Instruments spigot plugin by Cup0fCode. Pick a .mid, adjust it until it sounds right, then save it to a library you can play from later.
Aura Nexuses
Grant abilites based on large-scale constructions. Grant permissions dynamically.
Modern Industrialization Multiblock Editor
Customize Modern Industrialization multiblocks with KubeJS
Voltaic API Mod (1.21.1, 1.20.1) – Dependency For Electrodynamics And Nuclear Science
Voltaic API Mod designed to unify and support multiple mods. It replaces older dependencies and ensures smooth integration across industrial, nuclear, and military‑style mods, all aimed at recreating the Voltz experience for newer Minecraft versions. Features: Required for Electrodynamics, Nuclear Science, Assembly Line, Ballistix, Blastcraft, MFFS, ICBM, and more. Central to the effort of modernizing […]
RFTools Base Mod (1.21.1, 1.20.1) – Library for McJty's Mods
RFTools Base Mod is the base mod for all tech mods by McJty. This includes RFTools Dimensions, RFTools Control, RFTools Power, Deep Resonance, XNet, and so on. Features: Dimensional Shard oregen, small amount in the overworld, more in other dimensions. The machine infuser. Base crafting materials for the other tech mods. The smart wrench. Security […]
McJtyLib (1.21.1, 1.20.1) – The Foundation for High-Tech Worlds
McJtyLib is a companion mod required by all mods from McJty: RFTools, RFTools Dimensions, Deep Resonance and also by RF Lux by romelo333. Features: Acts as a required library for a large collection of mods. Allows various tech mods to function properly without crashing. Provides the necessary code for mods including RFTools, XNet, Deep Resonance, […]
VapourWare Mod (1.21.1, 1.20.1) – Library for VapourDrive's Mods
VapourWare Mod is a base mod created by VapourDrive. It serves as the foundation for several other mods and includes shared code for fuel-powered machines and a wrench. Features: Provides the logic and framework for fuel consumption, storage, and use in various machines. Adds a wrench that can be used to rotate blocks and disassemble […]
KubeJS Mekanism Mod (1.21.1, 1.20.1) – Design Your Own Tech Tree
KubeJS Mekanism Mod connects the Mekanism mod with KubeJS, allowing you to create your own custom recipes. With this addon, you can use KubeJS scripts to decide what items go into Mekanism's machines and what new items come out. Requires: Minecraft Forge KubeJS Library Architectury API Mekanism Mod Features: Lets you add new recipes for […]
Version Detector
An API for datapacks to detect your Minecraft Version
XD's Utils
XD's Utils is a utility plugin that provides backups, a web interface, and more!
PaperUI
A Java/Kotlin library for creating user interfaces on Paper servers
Per-Player Displays
A Minecraft Data Pack library for player-specific display entities.
Aquamarine
A Modern Industrialization-like multiblock library.
AgriCraft Create Compat
Adds harvester support for AgriCraft crops and integrates Create automation with AgriCraft's crop progression and weed mechanics
StarEvents
A library that passes events into a StarLib event bus. This is the plugin build for the library
GUI Command Blocker
GUICommandBlocker Stop players from using commands while they have GUI open! (Specially to prevent mod like ui utilis to sent commands in gui)
CatItems
CatItems is a plugin for creating custom items right in the game. With it, you can add attributes, enchantments, hide prompts, give permanent effects, create abilities on Shift, and build .schem schematics on right-click...
CheatsCaptcha
Плагин CheatsCaptcha ето плагин который проверяет если читы у игрока - The CheatsCaptcha plugin is a plugin that checks if a player has cheats.