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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.

Online Checker by Aycy

Check if a player is currently online.

OnlineCoin

Copyright 2014 - 2018 Volting

OnlineCoins

Copyright 2014 - Volting

OnlineCoinsToMoney

Copyright 2014 - 2017 Volting

OnlineLever Mod by Muka2533

Add a lever that can be operated on the Internet.

OnlineObject

This is an example mod

Only Microblocks by PplusS

This mod replaces the vanilla block drop with chisels and bits parts

OnlySilver by Zot

OnlySilver ports the silver ore and its derivatives from SimpleOres 1.5.2_1 to the later versions of Minecraft.

OnsenMOD

This MOD is beta