Minecraft Java 1.21 Mods
Browse 308 free mods for Minecraft Java 1.21 — popular picks include Boundless Blocks, Palettable, No Iron Golems Spawn.
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Boundless Blocks
Craft infinite building blocks from any mod. Never run out of materials again!
Palettable
Adds an in-game color gradient creator, aimed at making building more relaxing and digestible.
No Iron Golems Spawn
Disables the spawning of iron golems caused by villagers, spawn eggs, or commands. Iron golems can only be spawned by building them manually.
Mega World Height
Mega World Height expands the Overworld build and generation height, giving you much more vertical space for mining, building, exploration, and custom world generation. By default, Minecraft’s Overworld height is limited to a smalle
Create: Meat Blocks
Brings back Meat Blocks from MineFactory in a new, Create style! Features the slaughterhouse, ingots, straws, and baconator (autofeeder). Create your own meat processing plant today!
Vanilla X MC
This modpack is based on a Vanilla + experience ,it extends on base features and ands extra QOL feature plus extra mechanics
Toms Server Additions: Bouncy Castle!
Serverside colourful bouncy blocks!
ClimateCraft
Adds climate change mechanics. Building, mining, and smelting emit CO2, plants absorb it. Keep the environment in balance or suffer sea level rise, droughts, and wildfires!

Slashbridge
serverside utility mod aiming to add in minecraft commands that I think the base game lacks, bridging datapack and mod function.
Pandora ReForged
4YR Project building Pandora from the movie Avatar in Minecraft
MAKE YOUR BUILDING LIMIT UP
Think Minecraft doesn't have enough building space? Want to build taller buildings? Try our data pack and you can increase the building limit up to 4064 blocks!!
Beyond Border Unlocked
Bypass the vanilla worldborder building & combat limitations.
Inventory Profiles Plus
Inventory Profiles Plus is a client-side Fabric mod for custom inventory layouts, including Crystal PvP, Mace PvP, Sword PvP, Axe PvP, building, mining, and survival setups. Quickly sort items, cycle profiles, and keep gear exactly where you want it.
please stop
Defy physics! Please stop removes creative flight drift so you stop when you let go. No more building like you’re wearing socks on a waxed floor.
Marker Tower Builder
Craft enchanted shovels that build 100-block-high marker towers when dropped. Replaces tower-building hassle with effortless animated FUN!!
MHDF-Tools
MHDF-Tools | Dream Tools | ✨ A lightweight portable high performance Bukkit base plugin ✨MHDF-Tools | 梦之工具 | ✨一款轻量化便携高性能的Bukkit基础插件✨
AutoPunish
AutoPunish is an advanced Minecraft punishment plugin that automates warnings, mutes, and bans with a configurable escalation system, web panel, and database support for Spigot/Paper servers.
Don's Building Stuff
A collection of tools that makes building insanely enjoyable
Duelity
Duelity is a simple Open Source duel plugin made for SMPs and as a base for upcoming Duel servers.

Create: Craft 'n Extras
Create: Craft 'n Extras is a lightweight, vanilla-friendly addon for the Create mod that bridges the gap between raw materials and your building palette. It eliminates tedious crafting table grid-spamming by introducing logical, high-efficiency mechanica
Mansion D RPC
Easy to configure to make your Discord Rich Presence better.
Home TNT
Creates a new HomeTNT item that allows you to generate a simple village-style house.
GhostBlocks Remastered
Simple Vanilla+ Plugin, useful for building and map creation!
Hyeconomy
Diamond economy plugin uses MariaDB for database storage.
OutAuction
🏆OutAuction — Powerful auction house system with stylish GUI, 🔧 fully customizable sounds, and 📜 complete transaction history. 💰 Vault support, 🚫 item blacklist
Multi key Loudouts
You can have Multikey Loudouts for example: One for building, One for pvp
FPC - FixPlaceContainer
A client-side Fabric mod that allows you to place blocks on interactive blocks without opening them. No more accidental chest openings while building!
Arataki's greenhouses
This mod adds a new block, using which you can unload the routine of extracting items of plant origin, because now the greenhouse block will do it for you
WardenEssentials
WardenEssentials is a lightweight and powerful Minecraft server plugin that adds essential quality-of-life commands for admins and players, Perfect for building, server management, and everyday gameplay improvements.
ServerRewards
🏆 ServerRewards - A comprehensive Minecraft plugin that rewards players for combat, mining, and building activities with an in-game shop system, milestone rewards, and economy integration to boost engagement and retention.
Artilide
Artilide is a modpack that attempts to transform Minecraft's balancing and base mechanics to keep survival aspects for late game, along with overhauling exploration as a whole.

ZA - tools
This mod adds some QoL tools like skythes and building hammers.
Deck Of Cards
Tired of building/farming/traveling? Play cards with your friends!
Dyable Wools
Dyable Wools lets you dye wool directly in crafting tables, making colorful building easier and faster.
Kaban Central
Collection of Vanilla+ additions and changes for: building, exploring and chatting
Deploy & Destroy
A simple mod that adds some useful tools and a few building blocks.