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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.

UnderCraftMOD

Ceci est le mod d'UnderCraft

UnderMod

MOD BY UNDER

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 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.