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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