Fabric Mods for Minecraft 1.21
Browse 1,481 free Fabric mods for Minecraft 1.21 — popular picks include SDM UI Lib [Forge/Fabric], [Deprecated] Curios Compat Layer for Accessories, More Hitboxes.
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SDM UI Lib [Forge/Fabric]
A simple library that will simplify the creation of GUI
[Deprecated] Curios Compat Layer for Accessories
A Compatibility layer for mods using the Curios API to work with Accessories
More Hitboxes
Library mod that adds support for multiple hitboxes that can optionally be controlled by GeckoLib animations

Antique Atlas 4
A hand-drawn clientside world map, with map sharing, structure discovery, and less! A map frontend for Surveyor based on hunternif's Antique Atlas.
Lavender
A Guidebook API and alternative to Patchouli
Custom Machinery Create
Create support for Custom Machinery
The Impossible LIbrary
A library mod that makes the impossible possible in Minecraft
Beautified Chat [Client]
💬 A highly configurable mod to change the chat style and colour on the client.
Simple Discord Link Bot
A simple to use discord-minecraft/vice versa chat link bot with advanced features
Ember's Text API
Text rendering and styling API with effects, animations, and custom font support.
Iris & Oculus Search
A mod that adds a search bar to Iris and Oculus to quickly find and filter shader settings and shaderpacks.
Bundle API
An API for mods that allows easy addition of bundles with custom sizes and filtered content.
Sherds API (NeoForge/Fabric/Quilt)
Makes adding new pottery sherds easier
WATERMeDIA: Platform Extension
WATERMeDIA mod extension, adds YouTube, SoundCloud, Facebook, Instagram and Newgrounds support
Quad
Tags, More of them. Giving you more Power
Simply Tooltips
Modern data driven tooltip rendering
ModMenu Badges Lib
More badge!!!
Ledger
A serverside logging mod.
CraftedCore
Another API mod
SpiffyHUD
Addon for FancyMenu to customize the in-game HUD.
DungeonZ
Base mod to add new dungeons with one default dungeon
Bento Box
A modular library for expressive GUIs and declarative configs
Easy NPC: Core
Provides the core functionallity for the Easy NPC mod.
DragonLib
A library mod for all my other mods.
TLib
Library for Take's Mods.
One Enough Lib
A Lib for simplified development of the OE series
BoxLib
A client-side library mod with tons of features to do all the heavy lifting for all client-side mod developers.
ManasCore
Modding and Core Library by ManasMods
Factory API
An API that supports different mod loaders and is the basis of mods like Factocrafty
Lucky TNT Lib
The Library Mod to the Lucky TNT Mod!
Inline
a mod for inline text rendering
SDM Economy [Forge/Fabric]
A library for creating and managing currencies
Kev's Library
A library for Kev's mods
Lazr's Lib
A library containing many utilities for Lazr's Mods.
BjornLib
A library of generic code for my mods
Sparkweave Engine
Library to share code and functionality between projects