Fabric Mods for Minecraft 1.21
Browse 18 free Fabric mods for Minecraft 1.21 — popular picks include DulkirMod-Fabric, Better With Time: HC Tweaks, ArmorTweaks.
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DulkirMod-Fabric
A Quality of Life Mod for Hypixel Skyblock
Better With Time: HC Tweaks
An add-on for the BWT mod which changes some features to be more "hardcore".
ArmorTweaks
Different armor and damage mechanics that make make survival more suitable for PvP.
Carpet Minitweaks
An extension for Carpet Mod with many toggleable survival-oriented game mechanic changes

JoaCarpet
A small carpet extension mod with useful features for redstone and storage tech (+some minor survival tweaks)
Flight Mod
Fabric mod that adds hunger-based flight for survival or client only creative flight tweaks
JSST
A suite of server-sided quality of life tweaks and survival-friendly tools.
Improper's 3D Minimap
Minimap but with 3D terrain. Enhance your survival caving experience with this radar!
SkyButtons
Utility mod for Hypixel Skyblock focusing on low-latency warp requests with a fancy new optional menu.
Simple Survival Tweaks
A mod that allows you to tweak various aspects of your survival world
kutils
A collection mod of client side qol features and tweaks from older pvp mods but for 1.21+, with unique skyblock and ui features.
SkyFilter
Utility mod for Hypixel Skyblock. Loose cannon spam/scam filter.

Beefy's Survival Utilities
A few nice utilities made by BeefyAndTheDucks.
Ultimate Vanilla
A fully configurable collection of vanilla survival tweaks
Route Helper
This is a QoL mod for skyblock that adds player relative waypoints. This is most usefull for routing out grottos easily.
Carpet Minitweaks Mod (1.21.11, 1.20.1) – Extension for Carpet Mod
Carpet Minitweaks Mod is an extension for Carpet Mod with many small, mostly survival-related features and game mechanic changes. Features: Carpet Rules: In-game with /carpet list minitweaks By default, every rule is disabled, but can be enabled with /carpet (rule name) (value) Rules List: allChargedCreeperHeadsDrop All mobs killed by a charged creeper drop their head […]
JSST Mod (1.21.5, 1.20.1) – Custom Editors And Survival Enhancements
JSST Mod designed to enhance gameplay with quality-of-life tweaks and survival-friendly tools. It offers a suite of features like item, banner, and map editors, alongside gameplay enhancements such as beacon improvements and sapling replanting. It’s ideal for servers and single-player worlds aiming to streamline survival mechanics while maintaining a vanilla-like experience. Features: Includes a Banner […]
Armor Tweaks Mod (1.21.1, 1.20.1) – Tweaks Armor & Damage Mechanics
Armor Tweaks Mod makes some adjustments to the protection provided by different armor types and also tweaks the damage dealt by players wearing specific gear. The goal of these is to make the survival game more optimal for a PvP scenario. The list of changes as noted by the developer are given below. Features: Players […]