GregTech 5

GregTech is a mod, created by GregoriusT, which changes many IndustrialCraft 2 machines as well as recipes from other mods and introduces an entire new technology tier. It changes how many IndustrialCraft 2 machines work (requires machines receive constant EU for an operation instead of being able to 'stutter' through an operation) as well as adds several new ores and gemstone to the game.