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Uncle Jeff's Walls Mod by Jeffry Fisher

A new metadata-variant set of rock walls

Uncle Tomo's Minecraft Mod by Ablaze, Xornop, other friends

Bringing Uncle Tomo to your Minecraft world!

UncleGrandpaMod

Googmorning!

Unclunkify by phantamanta44

Makes life a little better.

Uncomplication

This mod just adds the old version of the new IC2 recipes.

Uncrafter by Jannis234

Did you craft something and you don't need it anymore? Use this mod and get your resoures back!

Uncrafting Blacklist by DoomRater, Noobanidus

Prevent items from being uncrafted in the Twilight Forest uncrafting table.

Uncrafting Dropper by Luis Cuesta

Uncrafting Mod by Ms_Raven

A simple mod that lets you convert items into the materials used to craft them.

Uncrafting Table by jglrxavpok

Did you ever want to uncraft an item (like your 5 hoes made by error) ? Now, you can do it against 5 levels of XP!

UncraftingMod

This is an example mod

Undead Crafting by Bjf1152

Adds many new things to the game to make use of bone, rotten flesh, and other hostile mob drops.

UndeadPlus by TechGuy543, GuitCube, RandumbDude, MrCompost, Tyler15555, Others

Undead+ adds a range of threatening new mobs to keep your Minecraft world alive and exciting during the night and while you're adventuring through caves.

UndeadUndeadnoMi

Fruta da Imortalidade

Under The Sea by Kashdeya

Adds Rocks and Seaweed for the Void Island mod.

UnderCover by owenl, MCreator

UnderCraftMOD

Ceci est le mod d'UnderCraft

UnderCrafted by Davdavmas, MCreator

UnderGround by PenguinMaster420, MCreator

A mod that adds the Underground update nobody asked for!

UnderMod

MOD BY UNDER

UnderUtilities by Loyto

Tab serveur + player skin + chat

Underarmor

Armor that goes under your players skin.

UndercastMod by skipperguy12, Genius_Fraser, GoldBattle, palechip, xIGBClutchIx, flv92, molenzwiebel

A custom made mod that tracks gameplay stats and has custom guis made for the oc.tc servers

Undercraft by ThePsionic

Minecraft meets Undertale

Underfell

This is still a demo but this is what I like to call the brother update

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 Ocean by Reoseah

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

Underground_1_12_2 by Brick, MCreator

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.

UniLib by CDAGaming

A common set of Utilities, designed for over 50 versions of Minecraft!

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