Xirion Mod by victorheld
The mod of the Xirion Modpack
Xlv's Locks by Xlv
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Xnet's Paxel Mod by Xnet/Dentsor, RUBIDDXX, Popill, Oxey/Mineaworld, mira03, mr_burn
Flann Gaming's Xnet's Paxel Mod.
Xp Ore by wombatty, MCreator
Adds an XP ore and Recipe to craft XP Bottles.
Xp Spawner Control by bright_spark
A mod to control the experience dropped by mobs spawned from mob spawners
Xp Storage by BrickMaster5000(SteveBeeblebrox), MCreator
Store your Xp!
XpCrafter
Hydra Mod
Xplosion Core by Big_Xplosion
A core for all the Xplosion Mods
XrayBlock
This Mod adds in a Simple feature which is an X-ray Block that allows you to see through Walls, Ground, Bedrock, And Caves. Crafting Recipe on the Forum post
Xtones by TehNut, Dhvagra, InsomniaKitten
Xtones adds modern/futuristic/fantasy style decorative building blocks.
Xtra Armour Mod
This mod adds armour such as Dirt Armour, Cobblestone Armour, Sand Armour, Gravel Armour, Invisi Armour and much, much more.