ModsJava
Slimefun4Core
Java mod listed for Minecraft 1.21. Download on the author's site.
⬇ Download on SpigotSlimefun 4.0-UNOFFICIAL is an updated fork of the original Slimefun4 plugin, maintained by R2Ksanu. It turns your Minecraft server into a modpack-like experience — without installing any mods.
This fork updates the original project from 1.19.4 to Minecraft 1.21.11, with full compatibility for modern Purpur and Paper servers running Java 21.
Features:
500+ custom items including machines, magic, and automation
Advanced technology and electricity systems
Magical crafting and altar systems
Improved startup stability and module handling
Optimized runtime performance for modern servers
⚠️ This is an unofficial fork and is not affiliated with the original Slimefun team. Always test on a backup server before production use. Licensed under GNU GPLv3.
This fork updates the original project from 1.19.4 to Minecraft 1.21.11, with full compatibility for modern Purpur and Paper servers running Java 21.
Features:
500+ custom items including machines, magic, and automation
Advanced technology and electricity systems
Magical crafting and altar systems
Improved startup stability and module handling
Optimized runtime performance for modern servers
⚠️ This is an unofficial fork and is not affiliated with the original Slimefun team. Always test on a backup server before production use. Licensed under GNU GPLv3.
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Spigot — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
Slimefun4Core is a free Minecraft Java mod. Compatible with Minecraft 1.21. Downloaded 538 times (via Spigot). Download it and open it directly in the game.