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Roshroom

Adds a single flower, sort of.

RotaryCraft by Reika

RotaryCraft is a large 'industrial-style' mod, akin to the likes of BuildCraft, IndustrialCraft, ThermalExpansion, and Minefactory Reloaded.

Rotateable Blocks

A mod which lets you rotate almost any opaque block any way you want to.

Rotmgmod

Wohohohoho new version

Rotten Fleash To Leather Mod

Burn Rotten Flesh To Leather Easily!

Rotten Flesh Mod by IvanTur

Useless to Useful.

Rotten Flesh To Leather Mod by Ayano Keiko (AyanoKeikoDev)

Copyright by Ayano Keiko!

Rotten Flesh to Leather

This mod turns rotten flesh to leather in a furnace

Rotten Flesh to Leather by DeltaGeek

Convert your stacks of rotten flesh to something useful!

Rotten Flesh to Leather - Ultra Hardcore Edition by Jake Janzen

Turn useless Zombie Flesh into useful leather!

Rotten Recipes by Konitor

This is a recycling mod: Armor to ingots. Armor and rotten flesh to leather.

RottenExchange by Lorant2

Rotten Mutation

RottenFleshChangeLeather

Linkseyi's ModMaker

RottenFleshToLeather Mod by Ayano Keiko, Seelenio, Sirily

Copyright by Authors

Rough Mobs by Lellson

Small mod which makes some vanilla mobs significantly harder

Rough Tweaks by Lellson

Adds a bit of extra difficulty

RouletteOres by Funwayguy, Darkosto

Random chance of ores to do stuff when mined

Round Robin Hopper by Ruuubi

Adds a round-robin version of Minecraft's Hopper.

Royalguardarmor

I want to one-hit the King and Queen in Orespawn!

Royalorespawn

Hmmm... a better armor than the royal set?

Rsmodymod

Mod made by Rienovie

Ru Hats Mod by HellGamer

This modification adds a decorative hats. It was created for the creator's project and the portal ru-minecraft.ru

Ruabm Mod

New Mod with cool Ruabm!

Rubberworks

This mod adds Rubber Trees to your worlds and, when harvested correctly, can create a variety of things.

Rubi's Rubies by Ruuubi

Adds uncraftable Gems to the game, which can be used as currency, as well as various blocks to promote trading between players.

Rubik

This is an example mod

Rubik's Cube Block by MuckPie

Decorative Rubik's Cube Block.

Rubis

Rubis!

Ruby Mod by legoman519 AKA 0CaptainMinecraft0

Adds in a Ruby block, ore, armor, and tools

Ruby Mod by Actizer

Ads Ruby, Emerald and Sapphire Tools and Armor to Minecraft

Ruby Tools! by alexs01

A mod that includes OP tools

Ruby-Craft_Mod by JamesDisco13

Adds Rubys to the game, Only to be used in the Ruby-Pack.

RubyCraft

Like rubies? Here ya go!

RubyCreeper

Mo creepahz!

RubyGemMod

Bored Of The Minecraft Items Dont Worry Use This Mod To Get Ruby Minecraft 1.7.2 Updated Bug Fixed Planning For The Next Mod!

RubyandSapphires

Adds 2 new gems

Rubymods

Dark, Ruby, Action!

Rubyseee

This is an example mod

Rucksacks by RenEvo

Adds colored ruck sacks and an ender ruck sack.

Ruins Spawning System by AtomicStryker, d00dv4d3r, kolt666, 4HeadTiger, Blue001

Allows highly customizable Structure Templates to randomly generate in your Worlds

worldgen dungeons

RuinsAndConstrucs

A reason to explore the world1

RuinsAndConstructs

Spices up your world with new structures!

Rule The World by Tichi

Create your village, build your army, and rule the world!

RuneCraft by pahimar

Transmute stuff into other stuff! Become a Minecraft God!

RuneTune by Jagex, Vazkii

Runescape music in minecraft!

Runeandisaacitem

This is an example mod

Runecarved by warlordjones, SkySom, DivineAspect

Curious is the trapmaker's art, his efficacy unwitnessed by his own eyes

Runes of Wizardry by LightningPig333, Xilef11

Magic. Runes. And dust. Lots of dusts.

Runes of Wizardry by LightningPig333, Xilef11

Magic. Runes. And dust. Lots of dusts.

Runes of Wizardry - Classic Dusts Pack by Xilef11

Adds the classic dusts and runes to Runes of Wizardry

Runescape

Saradomin!

Runic Dungeons by MrComputerGhost

Dungeons Galore, and a Dimension for More!

Runic Dust Mod by billythegoat101

A magical mod designed to give you power over your world through the art of magical runes. Sculpt the land or obliterate your foes all with your new-found magical know-how. DOES NOT INCLUDE ANY RUNES OR INSCRIPTIONS. Please install the DustModDefaults for those.

Runic Dust Mod- Decorative Runes by zombiepig333

A Runic Dust Mod addon that adds dusts for every dye color.