Forge Mods for Minecraft 1.21
Browse 819 free Forge mods for Minecraft 1.21 — popular picks include Happy Ghast Tiers, Reino de Celeste, WhenChat.
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Happy Ghast Tiers
Are your Happy Ghasts getting you down? Well wipe those tears away with Happy Ghast Tiers! This datapack adds five new tiers of harnesses each providing a small but noticeable speed boost. And as an added bonus we've added Ghast Treats!
Reino de Celeste
An Adventure and Mechanics ModPack, with the main focus being a dedicated Server for this modpack.

WhenChat
Prepends a [HH:mm:ss] timestamp to every received chat message — never lose track of when something was sent.
Feather Falling Rework
Makes slight convenience changes to the Feather Falling enchantment
Better Party X Waystones
Connects Better Party with Waystones: start group party warps, optionally allow officers to initiate them, and let the initiator pay or split the real Waystones cost across the travelling party.
Redefined Craftings
More & Improved craftings and uncraftings added into Vanilla.
Chorus Spells
This adds wands, crafted with chorus fruit, a stick, and magical items. These wands don't have any mana limit, but aren't too strong.
Real BodyCam📹
BodyCam adds a tactical-style camera system to Minecraft. A small window appears on your screen and shows the view from another selected player’s perspective.
Colly SMP [NO LONGER UPDATING]
The Official Datapack used in the Colly SMP, no changes, no tweaks, THE REAL DEAL!
CPVP Begone
Removes explosion damage from End Crystals
Succession
What if the world remembered what you did to it?
Better Entity Control
Take full control over mob and projectile attributes — modify health, damage, speed, armor, knockback, scale for mobs, and damage, speed, gravity, knockback for projectiles, with commands in Russian and English.
Craftable Light Blocks
Vanilla friendly light block crafting recipes, available as a mod / datapack format.
zzzZombie World
Makes the game only spawn zombies
SurvivalReborn
Survival Reborn enhances Minecraft survival with dynamic terrain, new biomes, and unique mobs, offering fresh challenges and gameplay mechanics. Explore, craft, and survive in a world full of adventure, ancient secrets, and powerful items!
Tiny Auth
Authentication system that allows you to use almost all characters (0-9, A-Z) with dialogs.
TESTIFICATE (TBS) HORROR
something with villagers seems a bit off...
Mace Limit's
Mace Limit is a datapack that restricts the mace to only 3 per world
Firearms
Resident Evil 4 inspired Firearms for Minecraft.
Fantastic Smelting
A small mod to boost your smelting-experience. Allows you to smelt raw resource blocks, saving you time and space.
CheckYourChest
CheckYourChest is a Minecraft mod that lets you track chest contents in real-time and receive automated updates via Discord webhook.
Only immortal mace
Now mace is only one and can survive even the Void

Peaceful Plus
Beat the game in peaceful mode!
Auto Brake Minecarts
your minecarts will stop once you leave them.
CloudFreeze
Allows users to freeze clouds, and manipulate their rotation.
Villager Follow You
The villager will follow you anywhere you go after you give him 5 emeralds.
Arrow Rider
Shot an arrow and ride on it thanks to an enchantment
Renewable Wither
This makes the wither drop three wither skeleton skulls in addition to a nether star. It's perfect for wither farms, or just to remove a tedious task.
Create: Jetpack-Vessel-Recipefix
Fixes the duplicate recipe conflict between the Small Filling Tank (Create Stuff 'N Additions) and the Fluid Vessel (Create: Connected).
Flux's Improved Wolves
A Simple Datapack that Improves Wolves with new Features and Better AI that is based on a video
Piglin Gold Trim Protection
Piglins ignore players wearing armor with gold trim
iammojogo's Village Info Plus
The ULTIMATE village mechanics tool for 1.12.2! Real-time stats, breeding analysis, golem requirements, 3D visualizations, and full customization.
Fast Golden Carrot Crafting
Makes golden carrot crafting faster
Geologica
Overworld biomes with natural rocks and sinkholes without adding bloat.
Decraft Blocks by Juix
Datapack that lets you uncraft blocks made from 4 items, like Quartz or Sandstone
Wither Aspect Enchantment
A reasonable alternative to Fire Aspect, with downsides