Mods for Minecraft Java
Browse 9,201 free mods for Minecraft Java — popular picks include Cloth Config API (Fabric/Forge/NeoForge), Placebo, Curios API.
Step by step: How to install Minecraft Java mods & modpacks
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Cloth Config API (Fabric/Forge/NeoForge)
Config Screen API for Minecraft
Placebo
A library mod
Curios API
A flexible and expandable accessory/equipment API for users and developers.

Fabric API
Lightweight and modular API providing common hooks and intercompatibility measures utilized by mods using the Fabric toolchain.
FTB Library (NeoForge)
Common code for all GUI stuff in FTB Mods
CraftTweaker
CraftTweaker allows modpacks and servers to customize the game. With CraftTweaker you can change recipes, script events, add new commands and even change item properties!
FTB Quests (NeoForge)
Questing Mod by FTB
Mantle
Shared code for Forge mods
FTB Teams (NeoForge)
Library for mods that can utilize team progression
Cupboard
Cupboard provides code, frameworks, and utilities for minecraft mods
CoFH Core
Contains Core Functionality for all Team CoFH mods. Also does some really cool stuff on its own!
ConnectedTexturesMod
A resource pack extension library
CodeChicken Lib 1.8.+
Contains various tools to make modding easier.
Item Filters
Item Filters is a library mod that is used by mods like FTB Quests. It adds several filter items that let you precisely select which items to match.
YUNG's API (Forge/NeoForge)
A library mod for YUNG's Minecraft mods
McJtyLib
Companion mod for all mods by McJty (RFTools, XNet, Deep Resonance, Not Enough Wands, SignTastic, ...))
Cloth Config API
Configuration Library for Minecraft Mods
Cucumber Library
A library of shared code and functionality used by my mods.
Iceberg [Neo/Forge]
A modding library that contains new events, helpers, and utilities to make modder's lives easier.

TerraBlender (Forge)
A library mod for adding biomes in a simple and compatible manner!
Cyclops Core
Library mod for EvilCraft, Integrated Dynamics and others.
Industrial Foregoing
A collection of machines to make your minecraft builds easier to automate
Framework
A common library powering all of MrCrayfish's Mods
YetAnotherConfigLib (YACL)
A builder-based configuration library for Minecraft!
FTB XMod Compat
Official multi-mod integrations support for the FTB Mods
ForgeEndertech
Core library powering Endertech mods
Fabric Language Kotlin
This is a mod that enables usage of the Kotlin programming language for Fabric mods.
Configured
Automatic in-game configuration menus for every mod!
YetAnotherConfigLib
A builder-based configuration library for Minecraft.
Shadowfacts' Forgelin
My fork of Emberwalker's Forgelin, with some sprinkles on top.
iChunUtil
Shared library used by iChun's mods
BdLib
A library of generic code for my other mods
Structure Gel API
An API for simplifying the developer end of creating generated structures.
MrCrayfish's Furniture Mod (Legacy)
Adds over 80 unique pieces of furniture into Minecraft!
ModTweaker
ModTweaker is an addon for CraftTweaker, a recipe manipulator utility for Minecraft. It allows you to modify the recipes of other mods that add their own crafting mechanics
Common Capabilities
Forge Capabilities that can be shared by multiple mods