J Piston by Jiraiyah
A mod that makes pistons more fun and upgradable in many ways.
J&A Mod by aik
Deko Items für J&A Modded Minecraft
J.A.K the Cyborg - Extra Bolts by JAK_the_Cyborg
Discover new technology and fight robotic foes in J.A.K the Cyborg - Extra Bolts!
JABBA by ProfMobius
Jabba (Just Another Better Barrel Attempt) is a storage mod aiming at making a better barrel than what is already out there. It introduces one block (the barrel itself), a set of upgrades and a dolly to move things around.
storage
JAIM
Overhauls the world selection screen