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OPNess by hjder, MCreator

OPPackTweaks by jmanpenilla

OPPackTweaks

OPSwordMod

This mod adds a REALLY Op Sword!

OPlapismod

This mod adds op stuff, all realting to lapis

OPswords by spychicken123, MCreator

adds many new swords

OPswordsMod by Spychicken123, MCreator

adds kewl new swords

OPweapon

Good luck...

ORESEVOLUTIONS by KronosEvolutions, MCreator

OS Materials Armor And Tools by Piotr86PL, MCreator

Adds Amethyst/Ruby/Ultimate/Emerald Tools/Armor and Lapis Armor From Orespawn Mod

OS Mod by This mod wasn't code by Hoang. It was me, DIO!

This mod can make minecraft bit easier or harder. I don't know

OSOG Bomzh serial by ubuntu, MCreator

OSRSMC by Tylersel

Adds some useful stuff.

OTG Cave Update by DedMaxim99

A cave update we deserve. This pack features caves and dungeons changes, bringing new experiense to underground part of Minecraft.

OTG: Dimensions

This worldpack demonstrates the multi-dimension features of OTG (Forge only). It requires the Flatlands, Skylands and Void worlds and places each world in its own dimension. You can construct a portal made of quartz or glowstone to travel between OTG dimensions and use the /otg dim console commands to manage dimensions.

OTG: Flatlands

A superflat world with many different biomes and super sized villages

OTG: Skylands

A Skylands world generator with interconnected floating islands and void below. Watch your step!

OTG: Tutorial World

A tutorial world for OpenTerrainGenerator content creators. This simple world shows you how to use OTG's settings to create basic realistic terrain.

OTG: Void

A void world with a single floating island at spawn