Up Mod by Void
A mod that will allow you to upgrade your character and use abilities for your own purposes
Up-Sizer by The_Wabbit
Lets you increase the max stack sizes of Minecraft items.
UpToDate by Strikingwolf, trajing, PhoenixTeam
Checks for updates
Update Checker by Tminor1
Will check for an update for Fun Craft Mod Pack 2.
UpdateCheckLib by makamys
A library mods can use to check for updates and display the results in a common interface.
Updated Blocks by Russia9
This mod adds blocks from new versions, for example concrete, andesite or granite.
Updatifier
Easy to use update checking for Sponge plugins.
UpgradableSwords
A mod that allows Vanilla Minecraft Swords to be upgraded into stronger swords.
UpgradeDustMod_1.12.2 by Alexi, MCreator
UpgradeSwords
Adiciona Novas Swords
Upgradeable-Armors by User, MCreator
Upgraded Armaments by 维生素
Backports the feature from 1.15 that allows quickly setting your spawn point without sleeping.
Upgraded Pickaxe by Hawaii_Beach, NicosaurusRex99