GregTech (for 1.7) by Gregorius Techneticies
This Addon adds the awesome Technology of GregTech-Intergalactical to your World! Fusionreactors, Lightningrods and many other Technologies and convenient Recipes are added by this Addon, if you let them enabled in the allmighty Config, of course
InstaPlay for Hypixel by JGSBroadcast
Creates a GUI that allows you to join games instantly on Hypixel.
mod_IngameInfo by DaftPVF, bspkrs, Lunatrius
Provides the ability to display many different player and world details on the in-game screen. ALT + I toggles info.
Gregic Additions by TheEmosewaPixel, Bartz24
An addon for GregTech Community Edition with the goal of making it much more complicated and realistic through the use of GregTech 5 Unofficial and GregTech 6 features.
GemCraft by Sanguine045
Ever think that emeralds are a vastly underimplemented part of the game? well here you go! this mod adds two more types or gemstone (sapphire and ruby) as well as full tool and armor sets for all three types of gem.