Quilt Mods for Minecraft 1.21
Browse 14 free Quilt mods for Minecraft 1.21 — popular picks include Fabric Seasons: Nature's Spirit Compat, Stellarity, Gigeresque.
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Fabric Seasons: Nature's Spirit Compat
Nature's Spirit compatibility for Fabric Seasons
Stellarity
Extreme rehaul of The End in a unique fantasy style, combined with biome and structure overhauls, new items, weapons and plenty of other content to discover.
Gigeresque
Gigeresque is a horror-themed mod that offers players a dive into the horrific biomechanical world of the xenomorphs, and the mutated realms of the neomorphs, deacons, and goo mutants.
Custom Biome Saplings
Allows Terralith and Blooming Biosphere trees to be regrown using vanilla saplings
RPGTitles
Small, cosmetic datapack that adds titles to small things in the game! See the dimension name when you switch dimension, see the current biome you are in and maybe get something when you kill a powerful foe..

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...
PicoHUD
Unobtrusive, player-readable coordinates, day, time, facing direction, and biome - with toggle/hold key modes. An alternative to minimaps and F3.
Enhanced Biomes Music
Improves soundtrack playback in biomes, adds an Intelligent Playback System in Mountain and Cave biomes — something that was so missing in Minecraft. Check out the description to see what else the mod improves.
Structure nature(Alpha)
we add everything we think is fun anything that will enhance the minecraft experience
LocalizedWeather
A Fabric mod that replaces Minecraft's global weather with localized weather zones. Each 256×256 block region gets its own weather, rain, snow, and thunderstorms happen independently across the world with biome-aware rules, smooth transitions, and blocky
BetterCreaking
The Pale Garden as it should be. A scary and dangerous biome
Geologica
Overworld biomes with natural rocks and sinkholes without adding bloat.
Biomes Unlocked
Makes biome-restricted resources more easily available or renewable

Slimes Everywhere
Allows Slimes to spawn at night in any biome