Jazzium Mod by Grayberd
Add an exciting new tier of items above diamond.
JdaLibraryLoader by FabioZumbi12
JeckelArmorMod by JayJeckel
JeckelArmorMod provides a few new sets of armor, specifically a set for each vanilla wood type and another one for stone.
JeckelMilkMod by JayJeckel
JeckelMilkMod implements milk as a custom fluid, allowing it to be used in fluid systems, similar to water and lava.
Jehovah's Core by Hye0Ngit
Math&Log library for Minecraft
Jeildsaddon by jorda, MCreator
Jeivillagers by Buuz135
A JEI plugin for veiwing Villager recipes
Jelly Beans by callumhutchy
Adds jelly beans to the game, nom nom nom.
Jelly Mod by Ldezian, MCreator
Jelly's Usage Blocker
Simple plugin to block and re-factor item usages.
JemsMo
Amazing Mod
Jen's Wacky Guesses by TheMinecraftOverlord
This mod adds in a bunch of mobs that Jen guessed incorrectly for the Challenge Games!