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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.