Minecraft Java 1.21 Mods
Browse 3,587 free mods for Minecraft Java 1.21 — popular picks include CobbleFight, EconGuard, Flame Announcer.
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CobbleFight
A dedicated ELO Battle system for Cobblemon
EconGuard
A shared economy audit ledger and anti-abuse / RMT-detection core. RoyalBank, RoyalAuctions, and RoyalBazaar report to it automatically, correlating money movements across banking, auctions, and the bazaar in one place. Free public API for any plugin.
Flame Announcer
A powerful and highly customizable announcement plugin featuring scheduled Chat, BossBar, and Interactive clickable messages with full in-game management.
Relocation
A simple building relocation plugin
Zurtrutium Lib
Common Library for Zurtrutium Modding
SpigotX
A flexible Java library for creating Spigot/Bukkit plugins with GUI, commands, and event handling.
Craftels API
This mod is an API for Project zomboid like "Craftels" (Moodles)
Maykesh's Server Observability Framework
A comprehensive server observability framework for Minecraft 1.21. Monitor tick timings, entity updates, chunk loading, network packets, and more with minimal overhead. Perfect for debugging, optimization, and rate-limiting systems.
PermsCraft
Minecraft Advanced Permission 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.
Aevum
Create, manage, and track timers with ease. ⌛
Vincible Moon Datapack
Dependency for upcoming update 2.0 of The Vincible plugin, planned to be optional
VanillaTweaker » Small changes, big improvements!
Qulaity of life tweaks for an improved vanilla experience.
Kore: Kotlin framework
A modding framework to enhance your Kotlin modding experience. Create mods the Kotlin-way!
HikariLib
A Utils Library for Minecraft Paper/Folia Plugin Developing.
RPGItemTweaksDefaultComponents
This is a rider datapack specificly for default components mod, rebalancing the RPG series mods and the ice and fire dragonsteel weapons, for my combat modpack.
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.
Custom Collision Box
A datapack library that can create custom collision/interaction box with management.
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!
Modern Industrialization Multiblock Editor
Customize Modern Industrialization multiblocks with KubeJS
VanillaCommandPlus
Flexible replacement for vanilla /gamemode and /tp: per-parameter permissions, customizable aliases, and MiniMessage messages, with Paper/Folia support and a public API.
Craftable Golden Enchanted Apples
This Datapack adds recipies for Golden Enchanted Apples.
⭐ ZenithCore ⭐ | The Ultimate Framework for Paper Servers | Quest • GUI • API • Hooks
Modern all-in-one framework for Paper 1.21+ featuring modular systems, powerful API, plugin hooks an
CognitiveReinforcementAndExistentialValidationFramework
Scientifically maximizes player self-esteem using procedural gradients and hyperbolic affirmations.
WorldScript [1.12.2-1.21.8] | ️RPG Region Framework | ⚡Dynamic Events & Player Progression⚡
Open-world RPG region events and scripting for Paper servers..
WMR(Wasabi Mine Regenerator)
A lightweight multi-language Minecraft plugin that regenerates mine blocks interactively. Supports 1.21.4
Vincible Moon
Dependency for update 2.0.0
Loremaster
The Loremaster in his Library will give guide books you can borrow.
WSXPay
Integrate real-world payments into WebShopX
XaraLib
A Library Plugin, For Other Plugins That Require This.
Various Sable Weights
Just added Weights for Sable by tags and then mod specifics. made it for myself and just throught I'd share.

Cratty
Adds an Pixel Icon Library to Minecraft
Aura Nexuses
Grant abilites based on large-scale constructions. Grant permissions dynamically.
Portable API
Portable API is a cross-version, cross-loader Minecraft modding API that lets developers share common code across multiple Minecraft versions and mod loaders.
ModularRarity
a ModularShoot × RarityCore integration mod