Neoforge Mods for Minecraft Java
Browse 64 free Neoforge mods for Minecraft Java — popular picks include Structure Gel API, YUNG's API, Oh The Trees You'll Grow.
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Structure Gel API
An API for simplifying the developer end of creating generated structures.
YUNG's API
Library mod for YUNG's mods.
Oh The Trees You'll Grow
Tree library used by popular mods such as Oh The Biomes You'll Go.
Formations (Structure Library)
Formations adds utilities for structure datapacks!
Duplicationless
A lightweight Minecraft library that simplifies JSON configs, block data storage, and entity tracking across chunks and dimensions.
Structures Tweaker
StructuresTweaker gives you complete control over how players interact with structures in your world.
WorldWeaver: New Dawn
An unofficially maintained continuation of the BetterX Team's utility library for Fabric and NeoForge, designed to streamline common modding tasks, especially those related to world generation
Sky Aesthetics
Change the minecraft skybox as you wish!
Hyle
A worldgen feature API for underground changing mods
Infiniverse
API for creating dynamic dimensions
More Density Functions
Utility mod to add more density functions for world generation datapacks.
Ars Monde Lib
Content library for Ars Monde
Preset Dimensions
Bare-bones modpack dev helper mod for copying pre-prepared dimensions into the dimension folder of newly created worlds.
Piglin Conservatory v3.0
Adds a news structure to the Nether, The Piglin Conservatory, along with a new Obsidian Apple, Dragon Fruit, Toxic Mushrooms, Hoglins' Fossils, Corrupted Emerald and a New Music Discs!
Worldgen Revisited - Now with noise caves!
OreTweaker, CaveTweaker, FeatureTweaker, WorldTweaker, and more!
Create: Dimension, Steamworks Realm
Create: Dimension, Steamworks Realm introduces a brand-new mining-focused dimension, designed for automation and large-scale resource extraction. This world is filled with rich veins of ores
Server Sided Portals
Create custom portals and dimensions compatible with any client!
Uniful
Unify Materials together!
Generator Accelerator
Optimizes the Minecraft worldgen and chunk management by introducing better calculations.
Easier World Creator (ewc)
library mod mostly designed for world-gen
CAWEZ'S Mantle to Stratus
A vertical expansion to Minecraft adding 3 new dimensions both above and below the Overworld, with many sights to see and challenges to overcome.
Modified Biome Source
Add modified biome sources that can be configured.
Keystone Expansion Pufferfish's Skills
MMO-style skill tree expansion for Puffish Skills, adding new progression categories like Combat, Mining, Exploration, Farming, Crafting, Building, Magic and Taming.
Health Enchantment
New enchantment that, when applied to armor, lets you get more health.
Dynamic Ore Veins
An API for creating and shaping custom large ore veins with datapacks!
Physical_structures API
Adds the ability to generate physics structures from Create aeronautics using the API during world generation.
Isekai API
A neutral primitive language for Minecraft worldgen — compose any worldshape (floating islands, new dimensions, layered worlds) from datapack. NeoForge 1.21.1.
Jump Enchantment
New enchantment that, when applied to boots, increases your jump height!

Genflower
World gen & loot utils library for datapacks and mods.
Big Globe - Just Enough Guns Compatibility
this mod adds compatibility between Big Globe generation and Just Enough Guns
Dimension Level Data
This mod splits weather and time properties across dimensions, so that different dimensions can have a different time/weather
Worldgen Flexiblifier
Adds flexibility to various aspects of vanilla worldgen, allowing customization of otherwise hardcoded parameters
IONite Powered
This mod is primary used to offer items and other things usable in data packs and the alike
U-API
A lightweight core API library for mods built around the U-API ecosystem.
EbonyLib
A Worldgen library for configured features and structures
better mob : jungle expansion
Better Mob: Jungle Expansion transforms Minecraft jungles with animated creatures, dangerous predators, immersive wildlife, GeckoLib animations, tropical atmosphere, rare mobs, jungle structures, and realistic exploration adventures.