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Obsidianshovel

This is an example mod

Obsidiansword

This is an example mod

Obsimond

This is an example mod

ObszidianCraft

Obszidian cuccok...

Occult Whispers by vulturefire/Corrupted Smoker

Enhancing Minecraft with Ancient Mythologies.

Ocean Adventures

Ocean world with cozy little islands and lots of adventures!

Oceancraft by thomassu

A minecraft mod made by thomassu, with many fishy, blocks and items.

Oceany Mod by CatDany

Technomagic in Depths of the Oceans

Ocelot5836's Craytunes Mod by Ocelot5836

A mod that adds a basic application that can play every registered sound event.

OcoMod by McJararaca

Press L and feel the oco.

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.

Odioita Mod! by TOMOKO_JSV, MCreator

OdogMod by Odog_Plays_MC, MCreator

A mod about dogs, cool!

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 Torcher by kegare

Player can place torch automatically while held torch on offhand.

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 Skins by WGOS

This mod get custom skins even in offline mode servers

OfflineSkins by zlainsama

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

OffsetMarker by Noto

Draw various position marker.

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!

OiOliveMOD by CatastropheNagaoka

Let's doing OiOlive! You can do it!

Old Beacon by zr2

Make beacon great again

Old Guns Mod by Zach2039

Old guns for that colonial feel!

Old Java Warning by Darkhax

Warns about old Java..

Old Obsidian by legobmw99

Re-add the old obsidian generation behavior with redstone wire

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

OldFlowers

Another update

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!

Omnifluids by EphysPotato

Makes every fluid placeable.

Omnis Core

Common and core code for all Jezza's mods.

On Further Tales: Explore Further by martinbv95, MCreator

Take Your Adventure Further

OnFurtherTales

Take your adventure further!

OnUPsMetals

adds new metals and tools

One Block Nether Portal

My submission for modjam4.

One Chunk Companion Mod by mttprvst13

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

One Way Glass by mrnate72, MCreator

One Way Glass

OnePieceWeaponsMod

Adds weapons from One Piece

OnePieceWorld

One Piece mod

OnePunchMan

Mod based off of the One Punch Man anime.

OneUPsMetals

lots of ores

OneUpsMiningMod

This is an example mod

Onion Mod by PingschelleMC

The Onion Mod (1.0.1a) adds onions, golden onions, onion seeds and the onion crop to your game!

Online Chat by Baseball45

A chat server and client that allows you to talk to friends regardless of whether or not you're in the same server as them.