Fabric Mods for Minecraft 1.21
Browse 6,618 free Fabric mods for Minecraft 1.21 — popular picks include Walk, Jog, Run!, Bundle Backport-ish, Alex's Caves: Refabricated.
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Walk, Jog, Run!
Adds a slower walking state and replaces exhaustion caused by sprinting with stamina caped by your hunger
Bundle Backport-ish
A backport of bundle mechanics using the original UI

Alex's Caves: Refabricated
An unofficial Fabric port of 'Alex's Caves' - Explore five new rare cave biomes hidden under the surface of the Overworld...
Tnt Limiter
A mod that limits the number of tnt rendered by the client to decrease lag with massive tnt explosions by an insane amount
Swimming Horses
Allows you to ride your horses THROUGH the river
Crops Need Sky
This mod makes crops and plants require direct sky access to grow.
Better Hitreg+
Clientside mod that registers hits before the server to make hitreg feel faster, includes various pvp utilities mainly designed for sword
Fabricia
A Vanilla modpack aimed at creating a lively environment, useful mechanics, and performance mods specifically tailored for Mulltiplayer and social gameplay. Previously known as Fabricstarter
Xavier Optimized
A modpack contains mods that improve and optimize the vanilla game experience without changing the game's mechanism.
Compostables
Compostables is a server-side mod that allows you to compost dozens of additional items
Account Switcher
This mod makes it so that you can switch account without closing minecraft!
FastPlace - Discontinued
A (discontinued) client-side fabric mod that lets you use right click functions faster by holding right click

Omnilook
freelook/perspectivemod but cooler
re:squake
Rewrite of a popular mod which brings quake-style movement to minecraft for Fabric mod loader in Kotlin
Immersive Infinity
Immersive Portals + An ever expanding list of portal compatibility from your favourite mods!
AutoTotem Plus
A 1.21+ compatiable auto totem mod. NOTE: THIS MOD IS NOT MEANT TO BE USED FOR BREAKING ANY SERVER RULES
SpaceworldMons [Cobblemon]
Adds in Beta Pokémon into your Cobblemon world!
XDBar
A cool little mod that tweaks some XP/Locator bar stuff

Glowing-entities
Minecraft client-sided mod that make entities glow!
Cobblemon Tools
Cobblemon Tools is the sidemod companion for the go to Cobblemon Pokedex website. Manage, create, import, and share teams & PokePastes in Cobblemon!
Cobblemon: Stamina Reload
This is a Fabric sidemod for Cobblemon 1.7.1+ that reworks how mounts interact with fullness mechanics. Each unit of fullness stockpiles an extra stamina bar.
WynnAspects
A wynncraft mod that enhances the gameplay experience.
Boss Score Toggle
Toggle bossbar and scoreboard visibility with commands!
Fox Friend
Make the fox no longer stay away from you and be able to tame it.
DarkRooms
Brings back the old dark room mechanic for farming flowers easily!
Better Enchanting
A complete overhaul of the enchanting system of Minecraft to make it rely less on randomness and tie it to exploration and game progression.
Spell Engine Extension (RPG Series Tweaks)
Extends the mod 'Spell Engine' with additional functionality.
Minehop
Source Engine Movement and Bhopping in Minecraft for a Better Parkour Experience
Hidden Ability Spawns [Cobblemon]
Adds a configurable chance for Pokemon to naturally spawn with their Hidden Ability.
Better Nameprotect
Changes your name client-side.
Fast Recipe
Adds quick crafting in the recipe book. Press [Ctrl + LMB] on a recipe to craft it instantly.
NoDim
A simple mod to disable end/nether portal collisions
OptiPlus-Anchor
Removes the wait between triggering a charged respawn anchor and the block clearing from the world. The anchor is set to air on the client immediately on interaction, so the slot is ready for the next placement without any server-confirmation lag.
Borukva Food
Server side food, new crops and food
Time Controller
Experience seamless control over the flow of time in Minecraft with this mod. It allows you to accelerate, decelerate, or even halt time entirely, all through the use of specific items.
Improved Anvils
Removes "TOO EXPENSIVE" and re-balances enchantment/repair costs of anvils.