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OogaBooga by jon, codetaylor

A variety of things Ooga Booga related.

Oops by darkevilmac

A solution for accidental placements.

Op Ore Mod by jacky, MCreator

Op Pickaxes Mod by Sonic, MCreator

OpBudder

This is an example mod

OpFuel

A FUEL MOD INFINITE

OpMe by andrenoel

A command to toggle operator status and creative game mode for players you preauthorize in a config file. I like to play as a normal player but be easily opped when needed. For security, nothing can add anyone to the list from in-game.

OpPickaxe Mod by tttymo16

A mod that ads a op pickaxe

OpWeapons

Good Luck...

Opalsplus

Adds Opals, Marble and Lots of blocks and Items to the Game.

Open Auth Mod by RK_01, Lenni0451

Authenticate with proxies during login or play state to allow online mode server switching.

Open Command Block by Zabqer

Command block with output

Open Glider by gr8pefish

Hang glider!

Open Grave

The simple gravestone mod.

Open Harvest by SBlectric

A basic open-source right-click-to-harvest-crop mod.

Open Modular Passive Defense

All a man needs are meat ingots, and big ass walls. Adds new walls and fences!

Open Modular Turrets

All a man needs are meat ingots, and big ass turrets. Adds a heap of new turrets and upgrades!

Open Scriptie by Pythonic_Rainbow

Adds realistic computer mechanics into Minecraft

Open Terrain Generator

Team OTG: PeeGee85 (code) MCPitman & LordSmellyPants (graphics, web, community) This mod is a fork of TerrainControl by Khorn, RutgerKok and Timethor. - Generate anything! -

OpenAutism by paburoshalom

A personal mod

OpenAutomation REBORN! by Sandra, AceK7

Automating the things!

OpenBackup by LotuxPunk

Backup mod for MinecraftForge.

OpenBlocks by boq, Mikee

All the things you never thought you will ever need...

opensource random enchanting

OpenBlocks Elevator Indicator by bartbes

Indicator for when the player is standing on an OpenBlock elevator

OpenCCSensors by Cloudy, Orwell1984, Mikeemoo, Nietsnie, Lyqyd, CoolisTheName007, thraaawn, foone

OpenCCSensors is an open source add-on mod for ComputerCraft which gives your computers the ability to retrieve information about the area around them

OpenComponents by Florian 'Sangar' Nücke, Johannes 'Lord Joda' Lohrer

This mod is an addon for OpenComputers that adds a bunch of drivers.

addon

OpenComputers by Sangar

This mod adds programmable, modular and persistent computers to the game

computers

OpenComputers Sensors by Davenonymous

Sensor Mod for OpenComputers

OpenComputers Xnet Driver by Davenonymous

Programmable logistics over Xnet Networks

OpenCrypto

A mod to extent crypto functionality for OpenComputers.

OpenDimentions

This is an example mod

OpenDisks

OpenComputers addon, allows for dynamically creating floppies in your filesystem.

OpenEEPROM by Grahmindol

add customized eeprom

OpenEnder by boq, Mikee

OpenEnder introduces small personal dimensions and encrypted dimensions into Minecraft

OpenEntity by ben-mkiv

Addon which allows to manipulate entities

OpenEye by boq, Mikee

OpenEye helps mod developers by tracking crashes and analytics to make the game more enjoyable for you!

util

OpenGX by ds84182

OpenLights

OpenComputers addon, allows for color changing lights.

OpenLightsController by MrMelon54

A controller to manage multiple OpenLights

OpenMods by Mikee, NeverCast, boq, Lyqyd

Boring stuff for all that silly Open* mods

library

OpenMods-IGW integration by TheSilkMiner

Integration between OpenMods and InGameWiki Mod

OpenNBT by AKCEJIb

Mod that add NbtCard for OpenComputers

OpenPeripheralAddons by Mikee, boq, theoriginalbit, foone

Random CC peripherals

opensource addon

OpenPeripheralCore by Mikee, boq, theoriginalbit, foone

Converts many blocks into ComputerCraft peripherals!

computers addon opensource

OpenPeripheralIntegration

Converts many blocks into ComputerCraft peripherals!

OpenPrivacy by Mikee

Little side-project of Mikees that'll tell you all communication your game is making with external services

OpenSabotage

Trying to implement minigames on Sponge

OpenScreens by its_meow

Adds new screens to OpenComputers

OpenSecurity

OpenSecurity an addon for OpenComputers

OpenSensors by MichiyoRavencroft

Sensors, for OpenComputers

OpenSolidState by AdorableCatgirl

A mod that adds some solid state devices.

OpenStuff by Grahmindol

This mod add stuff to OpenComputer

OpenTeleporter by NEO

OpenTeleporter this addon for OpenComputers adding teleports .

OpenWeaponry by lukas2005

A mod which adds various OpenComputers-activated weapons.

Opis by ProfMobius

Welcome to the wonderful world of Opis, the Minecraft Server profiler.This mod is a must-have for any server admin, as it will allow you to spot the chunks which are eating up your TPS, the worse tile entities or simply jump anywhere you want.

util

OpisReloaded

Contextual server profiler

Oplock by DoubleDoorDev, Claycorp

Locks down a server to only specific people. Ops!

Opo by Opo, MCreator

Opo

Opposite Dimension by ShaliAli, MCreator

Ever wondered what it would be like to have a world where hostile and passive mobs swap roles? With this mod you can experience that! With the Angry Chickens and the Huggable Creepers.

Opposite Dimensions by ShaliAli

Ever wondered what it would be like to have a world where hostile and passive mobs swap roles? With this mod you can experience that! With the Angry Chickens and the Huggable Creepers.

Opposite Dimensions by ShaliAli

Ever wondered what it would be like to have a world where hostile and passive mobs swap roles? With this mod you can experience that! With the Angry Chickens and the Huggable Creepers.

OptiCubes by Socolio, Time_Conqueror

Optibye by ThatGravyBoat

Removes Optifine CIT Loggers

Optifarbric Mod by Optifarbric

Optifarbric mod.

Optifine by Lunatrius

Import and export Minecraft schematic files in Minecraft!

Optifine Capes by Nearata

For those who are only interested in the optifine capes.

Optifine Checker by LeStegii

Checks if Optifine has been installed on the client.

Optifine extra Utilities for optifine by _Chelos_

Optifine extra Utilities for optifine

Optifix

Fixes bugs

Optimal Aim by Aycy

Displays the best location to attack your opponent.

Optimizations and Tweaks by I'm A Cat[FR]#7202

Just a mods targetted on Optimizations ,Tweaking and Bugfixings.

OptionSync by Ellpeck

A Mod about syncing your options between Minecraft instances