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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.

Underp Hangables by masa

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

Undertale

Sorry

Underwater Chest Bubbles by Squirtle8459

Upon opening chests underwater.. creates bubbles..

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.

Undestructible by The_Icy_One

Make your structures undestructible.

Unfathomed Depths Mod by Josh029

Ancient Technology of Mysterious Depth.