Minecraft Java 1.21 Mods
Browse 5 free mods for Minecraft Java 1.21 — popular picks include ZombieApocalypse999, Grimm's Mod, Materia-Reborn.
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ZombieApocalypse999
Zombie Apocalypse 999 is a comprehensive zombie survival plugin that introduces unique zombie mutations, an evolving threat system, player infection, custom crafting, safezones, and configurable gameplay mechanics.

Grimm's Mod
Everything you could want! Leveling, features of old mods, economy, technology, custom items, blocks, commands, transmutation of items and even more!
Materia-Reborn
A progression-focused Minecraft transmutation mod inspired by ProjectE, featuring Essence, upgradeable tables, rituals, storage, and smelting systems.

Ashen World
A Fallout-inspired survival mod for NeoForge that introduces radiation, mutations, contaminated environments, chem crafting, and dangerous evolutionary changes to your Minecraft world.
mutationcraft-plus
Adds 24 random world mutations that completely change Minecraft every 5 minutes, making every survival adventure unique.