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Oh the Biomes You'll Go! by AOCAWOL, MCreator

Enter a world of magic and exploration, biomes you go will make you journey far and wide for the ultimate adventure!

Ohome's Deco by Ohome Ltd., MCreator

Deco. Tools. Snacks. YAY!

OiOliveMOD by CatastropheNagaoka

Let's doing OiOlive! You can do it!

OilFlight by earth, MCreator

Olaf by UpcraftLP

Let it go!

Old Animations by asbyth

:crab: can never have enough animation mods :crab:

Old Beacon by zr2

Make beacon great again

Old Combat by chylex

Removes attack cooldown, and hides the cooldown indicator.

Old Combat System by hayper

Old combat system is back!

Old Guns Mod by Zach2039

Old guns for that colonial feel!

Old Java Warning by Darkhax

Warns about old Java..

Old Minecraft Mod by MonyaPlay, MCreator

OLD MINECRAF !

Old Obsidian by legobmw99

Re-add the old obsidian generation behavior with redstone wire

Old Ruines by Battiar

Old Sound, Eye Candy, & Animations by Adrenix

Brings back old sounds, eye candy, and animations throughout various old Minecraft versions. All changes can be toggled and swing speeds are heavily customizable. While this mod is intended for nostalgic enthusiasts, it may also be useful for those who are photosensitive.

Old Style Cherry Biome by Nanex

A simple mod that adds a cherry tree biome inspired from the one of Minecraft 1.20.

Old Swing by Adrenix

Brings back the old swinging animations before Minecraft Beta 1.8. All animation changes can be toggled. Moreover, swing speeds can be customized.

Old Swing Config by Adrenix

This mod lets you configure the swinging animation controlled by Old Swing Core. You can slow down - or speed up - the swinging animation using the config button in the bottom left of the screen.

Old swords by lucianofunari, MCreator

Old, Removed, and Newer Features by SillyMan0108

A mod that aims to add features from older versions of Minecraft, features that have been removed, and features from later updates.

Old-School Hunger by Elucent

Restores the hunger system from before Minecraft Beta 1.8.

OldBlocksMod

This adds a few old blocks to minecraft!

OldBookRecipe

This is an example mod

OldCraftable+ by uzaykecisi - HillMan

New crafting recipes and much more!

OldFlowers

Another update

OldFood

Stare Jedznie

OldInput by uku

raw input backport

OldRemovedFeatures-1.12.2 by SillyMan0108, MCreator

Readds old features

Older New by Mitchell, MCreator

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 Quest by Dorian2712

A fabulous quest to the Mount Olympus to get divine artifacts !

Olympus gear by amazing_zombie

The gear of the gods

Omega Additions by George Kazanjian

Provides additional content for Omega Minecraft Zoo Server

Omega Byte Blocks

Alpha Project

Omega Craft by Cobbs

Tech side of TSON

OmegaInfusion

A follow-up mod to OmegaCraft

Omni Mod by jacks

Omni Ocular by Epix

Omni Ocular

Omni Wrench by MrBretze

This OmniWrench !

Omni's Aged Aether Blocks by Lane, MCreator

Adds cracked, mossy and mossy+cracked variants of Aether Legacy's dungeon blocks

Omni-Goggles by Selim_042

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

OmniKings by Hedaox

An add-on mod for DBC.

OmniTools by KingLemmingCoFH, Cynycal

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

Omniconfig by Aizistral, juanmuscaria, CrucibleMC Team

The version independent configuration API.

Omnifluids by EphysPotato

Makes every fluid placeable.

Omnis Core

Common and core code for all Jezza's mods.

Omniscience Debugger by Laike_Endaril

An attempt at a be-all, end-all MC/Forge/Mod debugger...someday...maybe

Omniwand by Invadermonky

The wand to end all wands.

On Further Tales: Explore Further by martinbv95, MCreator

Take Your Adventure Further

On-Hit Particles by Aycy

Particles when attacking entities.

OnFurtherTales

Take your adventure further!

OnImpact by SakerTooth

Explosion on Impact. Simple, yet difficult. Why am I in your mods folder again?

OnTime by Cableguy20, STG_Allen

Playtime tracker

OnUPsMetals

adds new metals and tools

OnceLoModlar by vboxuser, MCreator

One Block Nether Portal

My submission for modjam4.

One Block Random by Tfarecmin

One block skyblock and randomizer

One Chunk Companion Mod by mttprvst13

This is the mod that adds the one chunk generator, and blocks.

One Punch Mod by Dragma2005, MCreator

It's a mod for One Punch Man

One Way Glass by mrnate72, MCreator

One Way Glass

OneBlockMan

ONE PUNCH!!!!!

OneBlockMod by Naturaspell

A mod about OneBlock

OneConfig by Polyfrost

OneConfig

OneCore by W-OVERFLOW

OneCore

OnePieceWeaponsMod

Adds weapons from One Piece

OnePieceWorld

One Piece mod

OnePunchMan

Mod based off of the One Punch Man anime.