Minecraft Java 1.21 Mods
Browse 53 free mods for Minecraft Java 1.21 — popular picks include item placer, Self-Sustainable, MT Inventory Weight.
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item placer
Place any item on any block side (supports multiple item in one block)
Self-Sustainable
Real survival, scarcity, very rewarding. Are you ready?
MT Inventory Weight
Weight mechanics! Manage your load, balance inventory, and enhance survival or RPG-like gameplay.
JoaCarpet
A small carpet extension mod with useful features for redstone and storage tech (+some minor survival tweaks)
Effortless Building: Sophisticated
Advanced building QoL mod with mirror/array/shape modes, expanded reach, per-axis placement limits, backpack-based building upgrades, compact HUD counts, and clear missing-item feedback for survival building.
RandomDirtDrops
RandomDirtDrops is a fun Minecraft data pack that makes breaking dirt blocks drop completely random items from the entire game — from diamonds to dragon eggs! Perfect for chaotic survival challenges and OP item speedruns.
The Grinding Table
Uncrafting, recycling, and more, all in one block.
Draventh Ores
⚒ Advanced Tier Ores & Equipment This mod expands Minecraft’s survival progression by introducing 15 new late-game materials, each with full armor and tool sets. The goal of this mod is simple: Extend progression beyond Diamond and Netherite with a struc
Antideath-Carpet-addition
Antideath-Carpet-addition is a Carpet Mod extension for Fabric Minecraft servers (versions 1.21.x - 26.2) designed to enhance and optimize the game experience. It adds a suite of new loggers for server monitoring and game rules for survival, optimizatio
Deepcraft
A hardcore Minecraft mod with new ore, weapons, bosses, mobs, a unique dimension, haunting music, and forgotten secrets waiting to be uncovered.
Rot Timer
Adds realistic food spoilage, barrel storage bonuses, temperature-based decay, and long-lasting canned stew for a deeper survival experience.
InventoryExchange
InventoryExchange is a Minecraft mod that extends player inventory management and integrates with ProjectE’s EMC & knowledge systems to provide a creative-like experience while in survival mode.
RS Infinity Booster FIXED
A Port from the original mod fixing the infinity boosters when using it in survival
LifestealSpigot
A premium Lifesteal SMP plugin for Spigot with tiered hearts, revive beacons, progressive crafting, beautiful GUIs, and SQLite storage. Perfect for hardcore survival servers!
Kindling Age
Kindling Age enhances early survival with lightweight, vanilla-friendly mechanics that make the first days more deliberate without adding grind or hard gates.
Shulker in a Shulker
Store shulker boxes inside other shulker boxes with configurable nesting depth, anti-dupe protection, and admin GUI control. Perfect for survival servers - includes /ns commands, cooldowns, item blacklisting, and full permission customization.
![UltraSpawners [LITE]](https://pub-2ae937f770284535a96c3330f91236aa.r2.dev/thumb/modrinth/151436.webp)
UltraSpawners [LITE]
UltraSpawners is a lightweight spawner management plugin featuring basic stacking, simple trust permissions, and economy based mob unlocking, designed for survival and economy servers.
BackPackSSS
Custom tiered backpacks with progression crafting, upgrade system and persistent storage — designed for survival servers.
Some KeepInventory
🛡️ Selective KeepInventory (Datapack for Minecraft 1.21.5) Selective KeepInventory lets players keep only specific items when they die — no full inventory saves, no complete loss. It’s a perfect middle ground for survival, multiplayer, and adventure-style
ExtraEnderchest
A plugin that adds the Large Enderchest (one block double inventory size) with customizable crafting recepie and extensive config
MeowFurniture
Create survival-friendly custom blocks, ores, multiblocks, crafting, and commands, with a web block generator.
Graves PRO
⚡ Grave system for modern survival servers ⚡
QoL
(1.21.5+), Adds Quality of Life features that everyone needs in their Survival worlds/servers (will also include some of my other datapacks/mods in here)
Combat-Hud Indicator
A lightweight multifunctional client-side mod that displays many HUDs necessary for both PVP and Survival gameplay.
Builders Bundles
A survival friendly fix to minecraft's inventory problem - designed for builders.
InventorySearchBar
A litte mod that add's a search bar in survival invetory to search for items
FirmaLifeHardCore
A mod that completely overhauls Firmalife's cellar and greenhouse mechanics — no Climate Station required. Enclosed spaces are auto-detected via BFS floodfill with dynamic AABB tracking. Any insulating blocks form a functional cellar or greenhouse.
Better Stone Crafting
Adds a variety of new ways to craft and recycle all types of stone blocks!
Compostable
Survival friendly plugin that makes more things usable for the composter block, like rotten flesh and fish!
ReddishTheBest's Survival Additions | RSA
Datapack with a few survival-centered additions. Crafting Table+, Multi-Tool, Diver's Helmet with more to come!
Advanced Redstone Expansion
Advanced Redstone Expansion adds sleek, survival-balanced redstone blocks, wireless quantum channels, configurable timers, smart filtering hoppers, and optional omni-directional redstone dust output.
Snailspeed
A Minecraft Mod Which Makes Survival Progress Longer
Nomadic Realms
Nomadic Realms offers a primitive survival experience. Logs are tough, so use flint; but wood tools are extra weak. Chests, furnaces, and loot must be found with exploration. Death randomizes respawn, but the new Ender Chest is now vital for all valuables.
SYSTEM SMP
System SMP is a premium Minecraft plugin designed for survival multiplayer servers. It adds unique features including small caps text formatting, tree felling mechanics, custom item displays, and an economy-based spawner mining system.
Guilds Remastered
Guilds Remastered recreates the World of Warcraft guild system in Minecraft, fully server-side with ranks, diplomacy, guild banks, private chat, and more. Ideal for survival and PvP servers focused on teamwork and progression.
HardProof
HardProof let's you check whether you have cheated on selected world or not. Very useful while trying to convince your friends that your world is pure survival