UniversoMOD by Mathanos
Unkitty's Minecraft Adventure by Elastico345, MCreator
Unkitty and it's crew finally crossover Minecraft for it's fans!
Unknown Ores
Useful Unknown Ores!
Unknown-Planet by lucas, MCreator
UnknownClient by !Privileged#8222
UknownClient developed by !Privileged#8222
UnknownLibs by -Unknown-
A collection of commonly used classes
UnknownPlayer by �y�R����
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Unkown
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Unlimitable Chests by Andrey Vilange
Unlimited Chisel Works by asie
why
Unlimited Chisel Works - Botany Compat by asie
flowers
Unlimited Chisel Works - Quark Extra by Wollis
This addon adds the limestone blocks from Quark in Unlimited Chisel Works.
Unlimited Chisel Works - TFC1 Compat by asie
TerraFirmaCraft 1 compatibility for Unlimited Chisel Works.
Unlimited Chisel Works - TFC2 Compat by asie
hexagons
Unlimited Colors by Veillardt
16 M Colors for your blocks !
UnlimitedChat by TheCrafter4000
Removes character limitaion in chat!
UnlimitedFuel
WOW UNLIMETED FUEL!
Unliquid
This mod adds the Unliquizer:you can use it for transform liquids in solid blocks.