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OcoMod by McJararaca

Press L and feel the oco.

Octahedroid by The_Icy_One

This isn't quantum tunnelling.

Octaves Utilities by OctaveClef

A series of utility items.

OctocraftDev

completely revamped!

Odds And Ends by SirSmashy

Odds And Ends for Minecraft, mostly centered around IC2, BuildCraft and Railcraft

Odds&Ends by yunori2011

Just a small mod to add some thingajiggers.

OdinClient by Odtheking, Cezar, Stivais, Bonsai, Ilmars

OdinClient is a versatile Forge mod tailored specifically for Hypixel Skyblock, offering a host of features designed to enhance your gameplay. You can access the GUI via the /od command.

Odioita Mod! by TOMOKO_JSV, MCreator

OdogMod by Odog_Plays_MC, MCreator

A mod about dogs, cool!

Odysseus MMORPG by GoatAndCow

Serveur Odysseus Minecraft

OdysseyHUD by Dplayend

thanks for download my mod

Oedldoedl Construct by TheP2WKing

An Addon-Mod made for TheP2WKings Oedldoedl Projects!

Oedldoedl Core by TheP2WKing

A Core-Mod made for TheP2WKings Oedldoedl Projects!

Oedldoedl Gear by TheP2WKing

An Addon-Mod made for TheP2WKings Oedldoedl Projects!

Oedldoedl Resources by TheP2WKing

An Addon-Mod made for TheP2WKings Oedldoedl Projects!

Ofalen Mod

This MOD adds a new ore Ofalen, to add a new such as tools, swords, armors, balls using it.

Off! The Mod by bafomdad

Spray off!

Offhand Lights by Tesseract

Make Dynamic Lights Available for Offhand.

Offhand Torcher by kegare

Player can place torch automatically while held torch on offhand.

Offhanded Gamers by GoodieBag, MCreator

ZIP Version, No proper description 4 u

Official MapleCrafted Mod by JayGhoul, and CicilStory

The Official MapleCrafted Mod adds in a variety of items to the minecraft world inspired by MapleStory.

Official Sword Craft Online Mod by JayGhoul

Custom mod made exclusively for the Official Sword Craft Online Modpack

Offline Auth by trollogyadherent

A Minecraft authentication system contained in a Forge mod.

Offline Mode by bsolos

Disable online mode for the internal server. That's it

Offline Skins by WGOS

This mod get custom skins even in offline mode servers

Offline Whitelist by HypherionMC

This mod allows you to actually use whitelisting while your server is in offline mode. No longer do you need to manually edit files!

OfflineServerUsernameWebRequestNetworkManager

A plugin that manages the network of web requests of offline server username

OfflineSkins by zlainsama

made it possible to cache your skins/capes for offline use

OfflineTweaker by xfl03

A mod to make WLAN server offline.

OffsetMarker by Noto

Draw various position marker.

OgaMod by おがちゃん

このMODは、以下の要素を追加します。 ・バニラレシピの一部を追加 ・作業台上での還元レシピを追加 ・IC2exのレシピを一部旧レシピ化 ・1.8以降のブロックを追加 ・便利なアイテムやブロックを追加

OgreSean Mods by OgreSean, GotoLink

Oh provoda! by Mechanesse

Provoda sheep mod.

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 World Gen by ted80

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