Forge Mods for Minecraft 1.21
Browse 5,334 free Forge mods for Minecraft 1.21 — popular picks include ArborFirmaCraft, Better Trees, Serene Seasons Plus.
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ArborFirmaCraft
A TerraFirmaCraft (TFC) addon featuring more varieties of trees

Better Trees
Vanilla style improvements for overworld trees.
Serene Seasons Plus
SereneSeason Plus (formerly Extended Fix) enhances seasonal immersion with sub season based day/night speed and improved snow piling/melting logic, delivering smoother and more natural seasonal block behavior.
More Mobs [Server] [Fabric/NeoForge]
Humanoid mobs get new variants through over 85 custom player heads or unused vanilla mobs! No Resource Pack needed!
MoreCosmetics - Free Cosmetics
A cosmetic mod that lets you customize your skin with cosmetics, wings and free capes!
CthuLib
Core utility mod for Pixel Dream Studios modpacks
KubeJS ProjectE
Lets you control various aspects of ProjectE with KubeJS

Withering Heights: Revamped Wither
Turning the Wither into something worth calling a boss.
Customizable Player Models Simple Voice Chat compat
Adds compatibility between Customizable Player Models and Simple Voice Chat
In-game NBTEdit Reborn
A mod adds a GUI to edit NBT of Entities or BlockEntities.
Super Secret Doors
secret doors!
Cosy Critters & Creepy Crawlies
Adds adorable atmospheric animals: birds, bugs, and bothersome creatures.
Slightly Flavoured
Carefully selected mods with a focus on quality over quantity!
Nether's Cruelty
🗡️ A "fun" new addition to Nether's Exoticism :)
Horse Stonks
Prevents horses from getting worse stats than their parents
Saro´s Money
Adds physical coins (1€–2€), banknotes (5€–500€), ATMs, and bank accounts for a complete multiplayer economy — with /pay, /eco commands, sign shops, and a leaderboard.
Sweety's Archaeology
🏺 A simple update to Archaeology, bringing new structures and relics. Vanilla style.

Luki's Woodland Mansions
New Mansions to explore and traverse.
Create: Garnished Reworked
Create: Garnished reworked to be more friendly for new players and less overwhelming.
Firma Crates
An addon to Apple Crates supporting the TerraFirmCraft mod
Mo' Enchantments
Add highly configurable vanilla-friendly enchantments!
Jobs+
Adds 10 jobs to Minecraft. You can now add your own jobs!
Ocean Lily Pad Village
Adds villages floating on giant lily pads to ocean biomes.
Remnant Bosses
Face the deadliest bosses ever forged combat, fights, and chaos await!
Haybale
A multiloader library mod for my mods
Glow
Replace the glowstone blobs on the Nether's ceiling with clusters of volatile glowstone crystals!
Smelt All Stone Blocks in Blast Furnaces [Fabric/Forge/NeoForge]
Blast all types of stone including Netherrack or Quartz, fully configurable
Bok's Banging Butterflies
A simple mod that adds butterflies to the game.
Sticky Enchanting Lapis
📖🔷 Allows lapis lazuli to remain in the enchanting table and be shared among players.
Abandoned Cabins (Regular Cabins too)
Adds abandoned cabins and regular cabins to taiga biomes
Prehistoric Paintings - Dinosaurs, Landscapes...
Replaces the vanilla paintings with prehistoric paintings.
Create: New Beginnings
Unique, vanilla+ structures added to villages and the world, featuring Create technology
Dropped Buffs
Adds buffs that can drop after a mob is killed. These will help you by providing various effects.
Put A Plug In it! (PAPI)
A small mod that fixes Memory Leak issues, optimizes Memory Usage, and increases version/loader support for features of other Memory Leak Fix/Memory Optimization mods
The Ducks
Add ducks to the game.
Multipart Machines: Farming
Adds multiblock farms.