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Rival Rebels by rodolphito

Rival Rebels is a PvP war mod with powerful weapons

Rivvest's Enhancements to Villager and Mob Performance by Rivvest

Configurable render & tracking distances; better villager door selection; prevents clumping of mobs; villagers climb ladders and avoid zombies better.

RoMiMoCo-Ores by the_rooster

Add JSON Defined ores, and associated items

Road Block by TheSgtPunishment

Inspired by the upcoming 1.9 feature

Road Blocks by GreenConsole

Adds blocks with a speed boost. Boosts NPCs and players

Road Mod by Papertazer

Roads in Minecraft

Road Runner by Thretcha

Move faster on Road Blocks that you define in the config!

Road Stuff by KillerMapper

Road Stuff brings everything you needs for your road dreams in Minecraft.

RoadWorks by Jonathan

This mod adds in tar blocks and different paints

Roadblocks by TheSgtPunishment

Inspired by the upcoming 1.9 feature

Roadworks by WThieves, The Minecraft Community

Giving minecraft some detail by creating more realistic streets!

Roasted

Uses for much seeds

Robbi Blechdose Mod

The first Mod of Robbi Blechdose. New ores, tools, a new dimension and other things.

RoboEye by Calisbeast

Adds two robotic 'eyes,' inspired by docm77's skin, that give night vision effect, and two helmets with toggleable night vision, so kinda like a less cheaty fullbright :P Toggle with 'V' by default.

Robot by Dom Amato

A Python Programmable Robot Avatar

Roboticraft by Dom Amato

A Python Programmable Robot Avatar