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Underground Biomes by Exterminator Jeff, Grom PE

Adds underground biomes composed of layers of new rock types

Underground Biomes Ore Integration by Harley O'Connor

Extra ore integration for underground biomes.

Underground City Engineering by beanflame, GoldMain, Mr_zhao

Underground Ocean by Reoseah

Small mod that adds large caverns filled with water to world generation.

UnderlineFix by Axer

Fix the bug which has caused unable to type underline on OSX.

Underp Hangables by masa

Fixes the derpyness of the dropped items from Paintings and Item Frames when they are broken.

Undersource 1.12.2 by REDFirmware, MCreator

Undertale

Sorry

Undertale Mod by JackTYM, MCreator

Underwater Chest Bubbles by Squirtle8459

Upon opening chests underwater.. creates bubbles..

Underwater Enchanting by Rick South

Allows the use of the enchantment table under water with maximum levels via bookshelves.

Underwater Enchanting by Rick South

Allows the use of the enchantment table under water with maximum levels via bookshelves.

Underwater Rails by Hennamann

Made for Modjam 5 adds 2 new rail types and tools intended for use underwater.

Underwater Utilities by Shadowfacts

Helpful utilities for working underwater.

Underwater World by MRC

Bring new life to underwater world

Undestructible by The_Icy_One

Make your structures undestructible.

Unecological Methods by BananaFructa

Allows the draining of chemicals into the waterways.

Unenchanting by Noobanidus

Providing ways to losslessly remove enchantments with an anvil.

Unessential by The Uranometrical Team

The most essential mod for Essential.

UnestableKit

Unestable Kit

Unexperienced by Smileycorp

Disables experience

Unfair Clocks

Not so easy anymore, eh?

Unfathomed Depths Mod by Josh029

Ancient Technology of Mysterious Depth.

Unforgiving Void by The_Fireplace

Sends you to the Nether when you fall in the void.

Ungrab Mouse Mod by Jaideep Singh Heer

This is a simple mod to allow players to ungrab the mouse to do other things on their PCs while the game runs.

Ungui by Mrkol

Declaring a war on GUI screens! This was made as part of MODJAM3. If you are reading this in 2014, then I probably got into top 10. Otherwise I would totally be all sad and stop modding for a couple more months :(

Unhealthy Dying by Mrbysco

Losing health from dying.

UniDict by WanionCane

a mod about unifying all the things.

UniMixins by makamys

UniMixins composite jar consisting of the following modules: Mixin (UniMix); Compatibility; Mixingasm; SpongeMixins; MixinBooterLegacy; GasStation; GTNHMixins; MixinExtras

UniMixins: Compatibility by makamys

UniMixins module that improves compatibility and helps debug crashes.

UniMixins: Future Compatibility by makamys

UniMixins module that makes the mod usable on 1.8.9 ~ 1.12.2.

UniMixins: Mixin (UniMix) by makamys

UniMixins module that provides the UniMix fork of Mixin (version: unimix.0.12.2-mixin.0.8.5).

UniMixins: MixinBooterLegacy by Rongmario, tox1cozZ

UniMixins module that provides MixinBooterLegacy extras and MixinExtras with MixinBooterLegacy's package name.

UniMixins: MixinExtras by LlamaLad7

UniMixins module that provides MixinExtras (version: 0.2.0-beta.8).

UniOre by ITO_Tim

UniQ by domi1819

OreDict unifier

UniTweak by HoganDazs

Adds CraftTweaker methods for patterned mod recipes. Supports: IE, Embers

Unicode Fix by Yukkuritaku

Fixing Unicode Font Bug Issues.

Unicode Font Extension by BRE

This mod allow you to read very small unicode fonts.

UnicodeFontFixer by oldjunyi

UnicornMod by SquidBananas

This is a Mod that adds Unicorns and a new Biom!!!

Unidye by LinusPhoenix

Makes Wool Dying and Dye obtaining much more convenient. Needs IC2.

Unified Items

Adds items and blocks like copper and tin so that we can have a more 'unified' playing experience

Unified Items by chazwarp923

Adds items and blocks like copper and tin so that we can have a more 'unified' playing experience

Unified Mode for In-game Account Switcher by The_Fireplace

The Unified Mode addon for In-Game Account Switcher

Unifier by grundyboy34

Item Unifier based on AutoUnify

Unify by Geoffrey McRae

Unifies Mod Item Types

Unify Ore by Dr0n1k

Adding ore, blocks, ingots and etc from useless materials mods

Unikitty Mod by Pauls Mods

Adds Unikittys which can be tamed as pets & a very OP armor.

UnimCraft

UnimCraft adds new Items and Blocks!

Unique Crops by bafomdad

Unique crops, unique growth, unique drops

Unique Enchantments Base by Xaikii, Speiger

Unique Enchantments Base Mod

Unique Enchantments Battle by Xaikii, Speiger

A Set of Unique Battle Enchantments

Unique Enchantments Utils by Xaikii, Speiger

A Set of Unique Utility Enchantments

Unique Ores

A mod that adds unique ores, items, and machines

UniqueFoodStalksMod

Adds New Food Items

UnitedCult

The second update in the series.

Unity by RandomByte

Unity items by Gagantorian

adds cosmetic walls to minecraft

Universal Bestiary by Lykrast

Gather infos on all mobs in your modded instance.

Universal Currency by mariofish

Adds a physical form of currency into Minecraft!

Universal Electricity by Calclavia, DarkCow, tgame14, Maxwolf, Alex_Hawks

opensource tech

Universal Input Fix by Meow J, Brian 1461748123

Input fix for GNU/Linux Mac Windows.(Test)

Universal Ore Library by Enderger

A mod that adds ores. They ae meant to be used in place of writing your own ores for your mods.

Universal Remote by Clayborn

Ever want a wireless... crafting grid? chest? any block in the game? Now you can! Use Universal Remote to access all the things from anywhere.

Universal Singularities by Wealthyturtle, WanionCane

A Mod that Adds an Unending Amount of Singularities!

Universal Tools Mod by Rubik's

Mod add Universal tools.

Universal Tweaks by ACGaming

A one-stop-shop for all bugfixing and tweaking needs

Universal Weapons by Darty11

A weapons mod that adds weapons for modded materials!

Universal: Interdimensional Escape Singularities by Wealthyturtle

Customized Singularities for the Modpack, Universal: Interdimensional Escape. Do Not Use Without Permission.

UniversalCommand

Little utility mod

UniversalCore by UniversalRed, big_Xplosion, SeamusFD, AEnterprise