Forge Mods for Minecraft 1.21
Browse 5,334 free Forge mods for Minecraft 1.21 — popular picks include Giant Brown Mushroom, Data API, Stacked Blocks: Farmer's Delight.
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Giant Brown Mushroom
Adds a giant Brown Mushroom to the Dark Forest and Mushroom Fields biome

Data API
Tools to aid in datapack creation
Stacked Blocks: Farmer's Delight
A compatibility mod for Stacked Blocks and Farmer's Delight.
Haven Growth (shift / twerk / sprint to grow plants and crops)
Squat, crouch, sprint, run, it doesn't matter! We grow anything*
Create Better Motors (Crafts & Additions Addon)
Addon for Create: Craft & Additions, introducing upgraded versions of the 7 Electric Motor and 3 Alternator.

Health Indicator
Displays players' health below their names.
Nyctography
Adds the Nyctography substitution cipher as a usable Minecraft font.
Giant Swamp Tree
Adds a Giant Swamp Tree to Swamp Biomes.
Cherry Hut
Adds a new Cherry Hut to the Cherry Grove Biome
Cobblemon : Simple Pokecenter
Add pokemon centers with healing machine and pc.
Armor Status HUD Renewed
This is a reworked version of bspkrs' ArmorStatusHUD mod for Minecraft.
CNPC-Gecko-Integration
An addon for Custom NPC and Geckolib3 that allows the use of geckolib models for your NPC
Bad Horse Fix
Fixes horse markings appearing above horse armor when using Iris or Oculus.
TFC Textile (Legacy)
TFC Textile is a addon for the TFC addon "Ambiental" that adds new clothing.
Reliable Replacer
A lightweight utility for replacing one block with another, both during worldgen and afterward.
Stackable127
Stackable is a mod that increases all block stacking limits to any value less than 127 for Minecraft 1.20-1.19.4.
[TaCZ] Curios For Ammo Box
Allows tacz ammo box to be placed in curios slots
Piggyback
Allow player riding each other and replace the default player sitting mechanic with a piggyback-style ride. Carry your friends on your back for fun, teamwork, or pure chaos!
Enhanced Snowmen
Finally, your snow golem army is not completely useless anymore.
Any Lanterns!
Add more lanterns with special models for decoration in vanilla style.
Cyanide
Reduces data pack world generation pain by providing useful, informative error messages.
Ecliptic Seasons: MultiMod Patch
Improves compatibility between other mods and Ecliptic Seasons by adding seasonal and weather behavior.

Tense Ambience
This mod enhances the atmosphere of all default dimensions with biome-specific, tense ambient sounds (Perfect for Horror Modpacks).
More Animals [FORGE] - 1.21 UPDATE!
A vanilla+ modpack ideal for animal lovers!
Macaw's Quark
A multiple compability for Quark with Macaw's Mods like Bridges/Roofs/or Fences.
Toms Storage Star Optimized
Lightweight optimization mod for Tom's Storage.
Better Library
This is just a simple lib for config, 1st join message and live message

3D Armor
Renders the player and entity equipped armor in 3D and is compatible with most modded armor, dyes, and trims with support for 16x resource packs.
Soul of Cinder Standalone 1.21
Standalone Version of the Soul of Cinder Boss and Abyss Watchers Boss for 1.20.1 and 1.21.0-1.
Better Runtime Resource Pack (BRRP)
A library mod to generated resource at runtime. Based on and made enhancements on ARRP mod.
Tax' Village Architect
Village Architect is a Minecraft Forge modification aims to upgrade villages.
Epic Knights: Antique Legacy
Adds antique stuff as an addition to Epic Knights mod
Battle Arts - API
Adds Battle Styles, Combat Arts, and Proficiencies
Mebahel's Creatures - Draugr Invasion
This mod introduces a full bestiary of Draugrs inspired by Skyrim, a boss with advanced AI, powerful magical items, shared multiplayer chests, new structures, and a raid system that turns the player into the hunted.
Death Angels
adds the monsters from the quiet place
AntiXray ((Neo)Forge)
Lightweight forge mod that allows server owners to combat xrayers