Minecraft Java 1.21 Mods
Browse 41 free mods for Minecraft Java 1.21 — popular picks include CB Multipart, Contained Opolis (A Space Adventure), Places.
Updated daily
CB Multipart
An opensource library for having multiple things in the one block space
Contained Opolis (A Space Adventure)
A space based skyblock style modpack
Places
A liminal space minecraft mod focusing on making exploring them a fun survival sandbox experience
space, fight and simulation
just a ily modpack made for fun :]
HammerMultipart
Library to place multiple things in one block space.
Space Studios Survival Pack
This Modpack is for the Space Studios community!
The Next Tomorrow Cobblemon (NO LONGER IN USE)
The Next Tomorrow is a heavily-modded Minecraft 1.21.1 Cobblemon Modpack designed as a fully-custom, story-driven Pokémon-style survival world. It blends exploration, tech, strategy, and cosmic mystery into one cohesive experience.
Time Vortex (TARDIS) - Neoforge
Embark on a journey through time and space with this survival-focused TARDIS mod. Designed for NeoForge 1.21.1, it offers a balanced and immersive approach to piloting your very own space-time machine.
Galaxy Sky
Galaxy Sky is a space-themed Skyblock modpack where the player starts on a small floating platform in the void with almost no resources.
![Liminal Shader [LOST]](https://pub-2ae937f770284535a96c3330f91236aa.r2.dev/thumb/modrinth/389279.webp)
Liminal Shader [LOST]
Perfect for horror maps, liminal space builds, and atmospheric survival gameplay.
AOneBlock
You start on a block in space. There is only one block. What do you do next?
Time Vortex (TARDIS)
Embark on a journey through time and space with this survival-focused TARDIS mod. Designed for NeoForge 1.21.1, it offers a balanced and immersive approach to piloting your very own space-time machine.
Fiber-Optic Cables
Adds a fiber optic cable, used to instantaneously transfer multiple redstone signals within a one block space.
Planetoids Skyblock
Skyblock world generation, but with resource rich planetoids.
horror things
its a horror game with the create mod and space how will this go
Sky Crushes
SkyCrushes is a progression-based processing mod that adds mechanical Trituradores (Crushers) to process raw minerals, geodes, and space materials.
Space Block Eclipse
Stranded on the Moon, you must survive and build with minimal resources. You build a Space Emperium and will rule over the solar system.
Arqone Frostline
Frostline is a survival-focused Minecraft modpack. Frostline Modpack is meant to be more than just a Modpack. It's a cozy winter experience, a space to connect, relax, and enjoy Minecraft during Christmas times.
SpaceFrog's Frog Variant Changer
Change a frog's variant type using a vanilla/survival-friendly method. Works with vanilla (cold, temperate, warm) and optionally 'More Frogs 2' variants: crimson, ender, infernal, poison dart, purpur, sculk, spirit, warped, and wood.
Minecraft But There Are RPG's
Five rocket launchers. One mission. Maximum destruction. Craft your way from a humble iron tube to a reality-warping Neon Launcher — fully survival-friendly, fully explosive.
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.
SpaceFrog's Cat Variant Changer
Change a cat's breed (variant type) using a vanilla/survival-friendly method. Choose from all kitty varieties: black, calico, jellie, orange (red), persian, ragdoll, shorthair, siamese, tabby, tuxedo, white & a special random type.
Better Rocket Crafting
Craft firework rockets (I–III) quickly with simple recipes. Just fast, balanced crafting for smooth Elytra flight. Works in survival and multiplayer.
Boxed
A game mode where you are boxed into a tiny space that only expands by completing advancements.
Clover's Pack Resource Pack (1.21.11) – Minimal Screen Clutter for Clean PvP
Clover's Pack Resource Pack clears up your screen by reducing visual clutter during combat and survival. It lowers the held shield model so it takes up less space on your screen. The pack also shrinks the totem pop effect, lowers fire overlays, and tints powdered snow with a light blue color so you can spot […]
Spaceworld Mons Data Pack (1.21.1, 1.20.1) – Catch and Train Forgotten
Spaceworld Mons Data Pack expands Cobblemon with over 80 prototype pocket monsters from early gaming history. It adds forgotten creatures, new evolutionary paths, and distinct combat attacks to your survival world. You can find these rare forms wandering biomes naturally, train them through battle, or evolve old favorites into brand-new forms. Features: Adds over 80 […]
Simple Ender Backpack Mod (1.21.11, 1.21.1) – Backpack Version Of Ender Chests
Ender chests are one of the most useful items in the survival game. If you have access to some obsidian blocks and an eye of ender, you can easily access this storage space from anywhere in your world. You can place items inside an ender chest in your overworld base, and then travel to the […]
Flight Mod (1.21, 1.20.1) – Glide With Hunger Not Rockets
Flight Mod lets you fly in survival mode by consuming hunger instead of using Elytra or creative mode. It’s a lightweight, client-friendly way to add immersive flight mechanics without breaking balance Features: Enables hunger-based flight in survival, no Elytra or rockets needed Costs food per tick, per meter flown horizontally, and per meter climbed Includes […]
Hyperbox Mod (1.21.1, 1.20.1) – A Portable Factory in One Block
Hyperbox Mod adds a special block that contains its own small dimension inside. Each Hyperbox you create has a unique space within it. You can pick up the block and move it anywhere, and the dimension inside will move with it. This lets you build complex machines or bases that take up very little space […]
CB Multipart Mod (1.21.1, 1.20.1) – Combine Parts in One Block
CB Multipart Mod (formely known as Forge Multipart) is an opensource library for having multiple things in one block space. Features: Allows multiple modded parts, like cables or panels, to fit inside one block. Acts as a core library that other mods depend on to add multipart blocks. Lets you combine different small items from […]
Communism Mod (1.21.1, 1.20.1) – Universal Ender Chests
Ender chests are one of the most useful blocks in the survival game. They allow you to access an inventory space anywhere in your world. As long as you have access to an ender chest, you can access this storage and collect/store items. In the vanilla game, ender chests are player specific. Communism Mod is here […]
Galactic Skies
GalacticSkies: A New Horizon Earth is gone. Rise from the void in this Skyblock-inspired pack, where your survival depends on colonizing new planets and building a galactic empire from scratch!
Galaxy Sky Space
A mod that transforms the sky and day/night cycle to make your world feel like a distant planet in space.
Project EGG: Echoes Of The Void
Dimensional Sci-fi horror and survival wrapped in a story-rich journey where your greatest ally might be compromised. Made by SpaceEgg on YouTube.
Terrarium by Lynxs Mod (1.21.11, 1.20.1) – Survive on an Accurate Replica
Terrarium by Lynxs Mod lets you explore a massive, pixel-perfect version of Earth right inside your game. It uses real-world elevation and climate data to generate mountains, valleys, and oceans exactly as they exist in real life. You can change the zoom level to control how big the planet gets, from a small survival map […]
Little Big Redstone Mod (26.1.2, 1.21.1) – Build Massive Redstone Circuits
Little Big Redstone Mod lets you shrink huge redstone circuits down into a single block. It adds a special Microchip block where you build complex logic systems that connect to your redstone, items, fluids, and energy. Features: Microchips: Places all your redstone logic inside one block's menu instead of taking up space in your world. […]