Minecraft Java 1.21 Mods
Browse 126,829 free mods for Minecraft Java 1.21 — popular picks include Demigender Pride Flag Hearts (7-Color Vertical), WntrWgItems, TitanItemEditor.
Step by step: How to install Minecraft Java mods & modpacks
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Demigender Pride Flag Hearts (7-Color Vertical)
Changes the Minecraft Hearts to a Demigender Pride Flag (7-Color Vertical) – Part of the Pride Hearts collection.
WntrWgItems
A high-performance, thread-safe WorldGuard addon for Paper & Folia to seamlessly disable overpowered item interactions inside specific regions
TitanItemEditor
"A powerful in-game tool for managing and editing item properties, NBT data, lore, and names with an intuitive interface."
Gamble Drops
Gamble drops is a Datapack where ever block drop or mob drop is rolled by (0 to 4) and you either get nothing or more than usual drops
A Lime
This mod literally adds a lime block, NOTHING ELSE, idk why I made this... You can only find in creative tab!
UltimateChatALLinONE
Ultimate Chat All in One is a powerful Minecraft plugin that combines chat moderation, anti-spam, banned words, automatic messages, warnings, and advanced chat management in a single easy-to-configure solution.
Openrouter Chat
A Paper plugin that lets players chat with an OpenRouter model directly from inside the game.
Swap Stone and Deepslate
Swaps stone and deepslate. Deepslate now spawns at Y>0 and stone now spawns at Y<0.
NoMob-Cows
NoMob-Cow — Completely removes cows from your server by preventing spawns and purging existing ones.
Tree Challenge
A simple datapack that only allows you to walk on wooden or semi-wooden block (and blocks that required for beating the game)
Block Stepper
This is a cool datapack that makes so you get whatever block you stand on. Doesn't take effect on some blocks like Leaves.

Links' Additions
This adds a bunch of random stuff I just wanted to code :P Now going public
Pasta's Command Blocker
PastasCommandBlocker is a lightweight and highly configurable command filtering plugin designed to give server owners full control over which commands and subcommands players can use.
BlsApple
This project replaces default texture of apple on bls texture
UltimateBoxed
The Ultimate Boxed Plugin : A simple-to-use plugin for servers of all sizes.
Simple TexturePack by SquadXTeam
A stylish and lightweight texture pack with simplified items and custom hearts by SquadXTeam.
ZyveraWeb-lite
Host a web server directly from minecraft!
CrownSleep
A plugin that makes minecraft sleeping much more interesting with buffs, etc.

elytra-plugin
A plugin for paper / folia minecraft server to adjust the elytra obtaining
Stoner Dark green
the green edition of stoner a selected bottoms
DeathSlimeSwap
Kinda simple death swap plugin with options for multiple players, random items option and easy customizability
ShellAtol Mod
This mod adds plenty of new stuff!
Sooqwess's Greece Mythology
The power of Olympus in your hands: Mythical weapons, legendary artifacts, and the awakening of the Titan Kronos.
Ponder Datapack Resourcepack
Resourcepack dependency for Ponder Datapack
XP = LIFE
This Plugin connects your life force to your xp giving debuffs and buffs based on xp
Russificator for Create: Aeronautics
Руссификатор для дополнения Create: Aeronautics
DFN: Craftable Dried Ghast
A simple mod that adds a crafting recipe for the Dried Ghast using 1 Fire Charge and 2 Ghast Tears
fluffy red stuff
the mod adds fluffy red stuff that can fall.

Vital lens
Visualization of the life of the mobs
Jub
Jub The Description says all Basically the mod is stuff revolving around the word Jub exept 2 mobs.
Upgradable SellChest Freemium
Let your players sell items automatically!
ServerMap | Location | Map Generator
Generate a map of your server region!
OGxEVENTS
Highly Configurable Paper Event Management and Event Organising Plugin
Better Command (TNew)
this project add speed command /day /night /exp

ChorusCooldown
Adds a cooldown to chorus fruit teleports.
Unwrapped Kelp
This Texture Pack makes kelp not wear a belt!