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OldRemovedFeatures-1.12.2 by SillyMan0108, MCreator

Readds old features

Oldowan Obsidian by Gyro

Some tweaks to obsidian.

OliveCraft by Joserichi

OliveCraft adds olive stuff like olive oil or edible olives to Minecraft.

Olympia by DasUmlaut

Olympia Project Core

Olympus gear by amazing_zombie

The gear of the gods

Omega Byte Blocks

Alpha Project

Omega Craft by Cobbs

Tech side of TSON

OmegaInfusion

A follow-up mod to OmegaCraft

Omni Ocular by Epix

Omni Ocular

Omni Wrench by MrBretze

This OmniWrench !

Omni-Goggles by Selim_042

Adds a singular pair of goggles, with the HUD effects of different mod's helmets.

OmniTools by KingLemmingCoFH, Cynycal

OmniTools mod! OmniWrench and Forge Lexicon; compress your toolkit and your ore stash!