Mods for Minecraft Java
Browse 450 free mods for Minecraft Java — popular picks include Under Control, LuckyUtils, RoomRecipes.
Step by step: How to install Minecraft Java mods & modpacks
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Under Control
Library with many utilities.
LuckyUtils
Utility Mod for LuckyBlocks by the LuckyCrew or LuckyBlocks in general
RoomRecipes
RoomRecipes is a utility mod which can detect a "rooms" and "room recipes". It is not much use on its own, and is typically used as a dependency for other mods.
Brigadier Extras
Brigadier Extras provides many utilities for using Brigadier.
Stranded Tweaks
Utilities for Modpack Makers!

Ev's Mod
MapArt collection sorting/copying, image export, visual bug-fixes, and other related utilities.
MasaAdditions Port
Unofficial port of MasaAdditions — extra options and tweaks for Tweakeroo, MiniHUD and Litematica
RaccoonCore
A lightweight core library for my Forge mods. Provides shared infrastructure and some small utilities.
WhatIsInThatShelf
See exactly what's on display! A Quality of Life HUD mod that shows you the tooltip of any item inside a shelf block just by looking at it
Solaris Patcher
Tweaks and patches for many 1.7.10 mods.
retroEMI Forge
Featureful and accessible modern item and recipe viewer with JEI/NEI compatibility
ForgeAnvil
My utilities mod and a API so people don't need to reinvent the wheel! AnvilModLoader is an easy one file way to load dependencies and mod packs!
Fruitbridge
This mod contains Fruitbridging utilities to assist players. Features are designed for both the Distance and Java 12b leaderboards.
Technology Valley Tweaks
Some addons for Technology Valley modpack
SCP CoreLib
A utility mod I use for all my SCP mods
Nexus API
Bulk of common platform-agnostic utilities aimed at reducing boilerplate/compatibility issues, thereby streamlining mod development on MultiLoader and other platforms.

ManaMetalMod Tweaks
Optimize performance and in-development content for ManaMetalMd
Kotlin for Forge Unofficial Extended Support
Adds a Kotlin language loader and provides some optional utilities, for 1.16.5
Terminal
b1.7.3 StationAPI library adding some utilities for mod developers
AWL Utils
Utilities for the RLNT modpack Anything we like
CRM
API mod that provides various utilities for using CometRenderer within Minecraft.
CNPC-XaeroMiniMap-addon
CNPC-Xmm-addon
Create Fly: Recipe Viewer
Create Fly recipe-viewer support for REI/JEI: mixing, crushing, pressing, milling and sequenced-assembly recipes.

Shlakoblock Utils
utility mod for Shlakoblock server: restart votes, news notification, etc.
EMUtils
A lightweight client-side utilities mod for Minecraft on Fabric.
Framed Maps Fix
Makes FramedBlocks display as their camo blocks on Xaero's Minimap, Xaero's World Map, and JourneyMap.
SOLEA API
SoleaAPI is a utility mod that combines homes, warps, TPA, teams, moderation, and combat-log tools into one configurable package with dynamic prefix support and EN/FR localization.
Hiiragi Core
Library and Utilities mod for Hiiragi's mods
RMKTweaks
Tweaks for my modpack
Fishcat's Genetics
Utility mod for basic Mendelian genetics.
Soulscraft Tweaks
Tweaks for modpack Soulscraft
ModUtilities
This is just a utilities mod that contains some common sources. This mod is only needed for the Quilt platform since it does not include the jar inside the mod which uses this dependency

Sinew
A library mod with general utilities and features.
Takion
Takion is a powerful Spigot library for advanced chat, text formatting, and messaging utilities in Minecraft plugins.
Easy Bee
A completly new way to trasport bees with extra tweaks
Abyssal Tweaker
An utility mod for modpack developers to adjust various properties of Abyssalcraft