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Opposite Dimensions by ShaliAli

Ever wondered what it would be like to have a world where hostile and passive mobs swap roles? With this mod you can experience that! With the Angry Chickens and the Huggable Creepers.

OptiCubes by Socolio, Time_Conqueror

Optibye by ThatGravyBoat

Removes Optifine CIT Loggers

Optifarbric Mod by Optifarbric

Optifarbric mod.

Optifine by Lunatrius

Import and export Minecraft schematic files in Minecraft!

Optifine Capes by Nearata

For those who are only interested in the optifine capes.

Optifine Checker by LeStegii

Checks if Optifine has been installed on the client.

Optifine extra Utilities for optifine by _Chelos_

Optifine extra Utilities for optifine

Optifix

Fixes bugs

Optimal Aim by Aycy

Displays the best location to attack your opponent.

Optimizations and Tweaks by I'm A Cat[FR]#7202

Just a mods targetted on Optimizations ,Tweaking and Bugfixings.

OptionSync by Ellpeck

A Mod about syncing your options between Minecraft instances

Options Enforcer by AstroTibs

Opus Magnum 1.12.2 by PapsCraft, MCreator