From Resonant Rise Wiki

Name iChunUtil
Creator Unknown
Type Core Library
Latest Version 2.1.0
Minecraft Version 1.6.1
Website iChun's Homepage
Root Mod Unspecified
Modpacks Blast Off!
Crundee Craft
DNS Techpack
Direwolf20 1.5 Pack
Direwolf20 1.6 Pack
Direwolf20 1.7 Pack
Feed The Beast 1.5.2 Beta Pack
Feed The Beast Infinity Evolved
Feed The Beast Monster
Feed The Beast Unleashed
JoeGaming ModPack
Sky Factory
Tech World 2
Test Pack Please Ignore

iChunUtil is a shared library required by most of iChun's mods, including Gravity Gun, Portal Gun, Trail Mix, Torched, Attachable Grinders, Mob Amputation, Mob Dismemberment, and others.