Minecraft Java 1.21 Mods
Browse 209 free mods for Minecraft Java 1.21 — popular picks include Create: Lights & Controls, Create: Capsule Corp., AntiRedstoneLag.
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Create: Lights & Controls
More lights and wireless redstone switches that plug straight into Create's Redstone Link network
Create: Capsule Corp.
Capture, store, and redeploy Sable simulated contraptions using capsules.
AntiRedstoneLag
prevents lag machine in server
Aeronautics Display Link Fix
Fixes a bug where Display Link's TargetOffset gets corrupted during physics assembly/disassembly when the display link and its target sign are on the same contraption in Create: Aeronautics.
SG Tracks
SG Tracks adds tracks that work like regular wheels for Create Aeronautics. You don't need any extra mounting blocks — just place the tracks directly on your machine and build your contraption.
Redstone Additions
Best redstone&tech datapack, Super optimized, 55+ blocks (Block breaker, block placer, filters, conveyors, item pipes, breeder, generators, gates, chunk loader, wireless redstone, multiblocks, jetpacks and so much more ! )
Circuitry & Magic
Combines Redstone mechanics with the art of enchantment and adds unique synergy between the realms of magic and technology.
Tanglr
A time-tangling time-travel based redstone mod
Create Aeronautics Addon: Plough & Roll!
An Addon for Create Aeronautics that adds functionality to the Mechanical Plough and Mechanical Roller on Simulated Sable Contraptions.
Create: Strict Links
Makes Create Redstone Link frequencies respect data components (NBT), for more frequency diversity and even password protection via named items or written books.
In Game Calculator
Adds a /calculator command to Minecraft for quick in-game math. Supports basic operations, parentheses, crafting math, coordinate conversions, hopper timers, geometry, time conversions, and random number generation — perfect for builders, redstone engineer
Redstone Robot
Redstone robots that recharge with redstone, can follow you, attack hostiles mobs with bows and a iron swords!
Redstone Essentials
A mod that aims to improve the redstone experience when working with complex computational builds
Amethyst Elevator
Simple amethyst block elevator datapack that lets players move up and down instantly without redstone or cheats.
Hero Statue
Adds the Hero Statue block, which can hold an item, and be posed using redstone.
Remote Lights
Link redstone lamps and copper bulbs wirelessly!
Create: Tow & Haul
Towing gear for Create physics vehicles: a redstone winch that reels a real steel rope, tow bars to hook it to, and a coupling that joins two tow bars with a rigid drawbar so you can actually pull a trailer. For Create: Aeronautics / Simulated.
Redstone Logic
Welcome to a world of precision engineering and endless possibilities with the Redstone Logic mod! Dive into the mechanics of advanced redstone circuitry as you master the art of creating sophisticated machines and automated systems.
Redstone Chunk Loader
A all-in-one chunk loader, for your many needs. With settings for server owners.
Midrian - Redstone Revolution
It simplifies all Redstone logic gates into single, functional blocks.
Leafstone
Lock any dripleaf state via redstone
Copper Wiring
Lightning Rods can function as electrical wires, transferring power in ways Redstone cannot! Circuitry has been transformed!
AntiRedstone| Advanced Redstone Lag Prevention [1.18 - 1.21.4]
A performance-friendly plugin that blocks all redstone activity on your server and reports coordinates of redstone spam attempts.
Create: Restone (link) Funktions and Colored Pixels
RedstF extends Create with new Redstone Link mechanics: programmable functions, more frequencies, and RGB displays.
Brick's Fair Crafting
This project makes hoppers, armor stands, dispencers , cakes, golden apples, most redstone, and blast furnence easy to craft.
Proximity Lamp
Adds 4 light modes: proximity, nocturnal, permanent and proximity-nocturnal. Works with redstone_lamp, candles, copper_bulbs and campfires.
Variable Copper Bulb Signal
This mod changes the comparator output of copper bulb based on its oxidation level. It matches the light level and redstone signal.
Create Redstone Link Essentials (CRLE)
This project adds some functions to redstone links from the create mod as : The items in links need to have the exact item data(tags, name, minecraft item id) to activate other linked controllers with the frequency. it also adds ID items
Analog Redstone Lamp
Lets redstone lamps emit variable light levels based on redstone power strength.
Fiber-Optic Cables
Adds a fiber optic cable, used to instantaneously transfer multiple redstone signals within a one block space.

Whitestone Mod
Added "Whitestone" electric system similar to Redstone, but removed the delay, and let the signal can transform vertically. And added a few bugs! Note: Developer misspell 'transmitter' into 'transformer'. This bug is already fixed in 0.3.0.
Redstone Additions
Adds breeders, block breaker, conveyors, block placers, and more !!! Vanilla friendly
CU later
My take on a datapack that replaces redstone component's iron with copper (and some other tweaks)
Redstone Underwater
Redstone can now be waterlogged!
Redstone Torch Equality
You get 4 redstone torches for the recipe
Enhanced Rails
Enhanced Rails supercharges Minecraft rail systems with lightning-fast speeds, automated minecart loading/unloading, and a no-redstone pushback mechanism.