Fabric Mods for Minecraft 1.21
Browse 14 free Fabric mods for Minecraft 1.21 — popular picks include RPG Inventory, Spell Engine Extension (RPG Series Tweaks), VR Jester API.
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RPG Inventory
This mod adds new equipment slots and other mechanics found in popular RPGs.
Spell Engine Extension (RPG Series Tweaks)
Extends the mod 'Spell Engine' with additional functionality.
VR Jester API
Virtual Reality Gesture Recognition API for Vivecraft and QuestCraft
Overgrown's Sync
A system for yielding new capabilities. Sync is an addon for the Apoli mod that's used primarily for the Origins mod!
Chat-With-NPC
Chat-With-NPC allows players to freely chat with NPCs, who will answer questions based on his setting (Basic Prompt) and the setting of their Groups (Nation, City, Town ,etc.). Suitable for RPG maps or puzzle maps.

PowerChord
A component-driven RPG instrument system - you know, hunting-horn-likes!
RPG Crafting
Introduces an alternative/replacement/addition to the traditional crafting system. It is heavily inspired by games like Valheim and Terraria.
OriginsxTrinkets
This mod allows player to create their own custom trinket items using the origins mod
Ai Helper
Chat with AI directly in your Minecraft world! Transform your Minecraft experience by bringing the power of artificial intelligence right into your game. No more alt-tabbing to ask questions or get help
Refined Enchanting
Level up your gear! Refined Enchanting adds RPG stats, tool badges, sleek tooltips, and a robust API for modders.
GenericCodeLibrary
Contains the common code used in most of KSmc_brigade's client-side mods.
One Block To End All One Blocks
Quest-driven one block survival for Fabric 1.21.4. Break your block, earn drops, complete quests, advance through 6 phases. Multiplayer-ready with team islands and bridge merging. Requires Fabric API.
Event UI
Custom quest & UI system for servers rendered client-side via Fabric.
SimpleCore by Cooshh
A shared core library for Simple mods, providing common systems like economy support and shared utilities.