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Rocks by Arc18 & Lavagun18, MCreator

Add several rocks same as andesite, diorite and granite.

Roguelike Dungeons by Greymerk

A mod that adds random dungeon complexes to the world

RoleClient

Mod Offciel de Role Craft

RolePlayMod

The Role Play Mod Adds Various Items For Your Roleplays

Rolik Core by Rolik

Main core for all Rolik's mods.

Rollercoaster Mod by roboyobo, modmuss50

Adding the ability to create roller coaster tracks into minecraft!

Romaji Search by BRE

Enable romaji search on NEI/JEI. migemo-dict is required to use.

RomanMod

The Roman Mod version 0.1.1

Roost by Tim Wood

A place for chickens to rest

RootMod by Minecraft Name : Drag0SEaters, RootSlayers

This mod is in Alpha.

Roots by Elucent, werty1124, AlexisMachina, SirShadow

Druidic Magic Mod

Roots Classic by Elucent, Lothrazar

Classic port of Roots, the Druidic Magic Mod

Rope Box mod by thomassu

Adds the Rope Box, where you can make ropes vertical and horizontal!

Rope Bridge by czechmate777

A mod that adds rope bridges to Minecraft. Craft the grappling gun and shoot it over a gap large or small to build a rope bridge across it.

Rope Exploration Pack Mod by HyagoSanter

This exploration themed expansion pack adds ropes to Minecraft.

Rope Ladders by Selim_042

Adds rope ladders that can be dropped from above.

Rose Mod by Tyler Arbon

Adds rose moss stone

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