Fabric Mods for Minecraft 1.20
Browse 1,200 free Fabric mods for Minecraft 1.20 — popular picks include Customizable Player Models Plasmo Voice compat, Minecraft SQLite JDBC, Thematic Core (Fabric).
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Customizable Player Models Plasmo Voice compat
Adds compatibility between Customizable Player Models and Plasmo Voice
Minecraft SQLite JDBC
Up-to-date SQLite JDBC driver wrapped as a universal Forge/Fabric/Bukkit library for plugins like Dynmap and Grim.
Thematic Core (Fabric)
Core mod for Thematic Superheroes
Cyber Permissions
Permissions Mod for Fabric
Generator Accelerator
Optimizes the Minecraft worldgen and chunk management by introducing better calculations.
MCC: Island - Companion (MCCI)
Your MCC: Island companion mod!
Koala Lib
Multipurpose Library used between many of my mods! Adds Configs, Mod Update Checkers, Post Processing Shader Registration for Render Layers, Toggle-able Magic Meter, etc
Obscura's Panoramica
Obscura's Panoramica is a client-side Minecraft mod that captures a full six-image 360 panorama with one key press, forcing 90 FOV, hiding the HUD, freezing singleplayer simulation for clean results, and saving ready-to-use skybox files in-game instantly.

HotbarAPI
API for adding Status Bars, highlighting hotbar slots, and more
Graal
High performance JavaScript runtime, tweaked for Minecraft usage
SpASM
Dynamic ASM everywhere
1wholibs
A library for json data files, obj model entities, and custom animations.
Appli
Phantom's extension to A Power Library (the name stands for A Phantom Power Library, original I know). Appli is an addon mod to Apoli, a mod adding a data-driven power system.
UltraLib
Non-intrusive java code library
Roughly Enough Config Screens
Adds configs screens for library mods such as Forge, and Framework.
VS2 for Complete Config
A version of Valkyrien Skies 2 that is compatible with Complete Config and any mods that use it.
Moonlight Core
Moonlight Core is a layer abstraction of Minecraft mod loaders that is aimed to help with multi-loader mod development giving developers utilities for their mods.
Collectively
Collectively is a simple library needed for older Collective's mods

Hexpose
A library addon for Hexcasting that adds many scrying patterns and iotas for other addons to use
Pebble's Cosmetic Render API
Renderer API to allow for certain cosmetic slots using Trinkets Polymer port to render client-side for people running it.
Piglib
Adds tags for various Piglin related things
Crafting Manipulator
Library mod for fabric that lets you modify crafting results and more
Sleep Anywhere
Sleep anywhere without a bed!
Soul Squad Origins
A group of soul-based origins for the Origins Mod
Custom Machinery Botania
Botania support for Custom Machinery
Create: Zinc craft
No more missing zinc! This mod adds a simple recipe: for zinc nuggets using Create’s mechanical press. Perfect for players who love automation!
TacZ Mesh Loader [TML]
This mod allows you to load mesh geo models created with the Meshy plugin into TacZ.
Berezka API for Underground Bunkers
This mod adds config to Underground Bunkers mod
MySQL JDBC (Fabric/Forge)
MySQL JDBC Driver for Minecraft
Jello
A Fabric Mod based around Slime and Color
T88
A lib-mod by USS_Shenzhou
Brutal Nightmare Config Integration
Add global config menu for Brutal Nightmare
LimLib
library to simplify aspects of modding (like configurations, registration, commands, etc...)
FScript Lib
Library for adding scripting to a mod
Rules4Worlds
A library mod for fabric mod developers that enables you to easily create world-specific gamerules.
Squished
Allows gravity affected blocks to squish you when they fall on you!