Engineer's Toolbox is a tech mod with a focus on customization. It's based around blocks called sockets which can have modules installed on their sides to serve various functions. Different modules can do everything from simple redstone logic, to generating energy
ExtraCells by M3gaFr3ak
A Mod that adds 4 new ME Storage Cells and some other cool stuff to AE.
tech addon storage
GregTech 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
IndustrialCraft 2 by Alblaka, Player, RichardG, Thunderdark, GregoriusT, alexthesax, Drashian, Elementalist, Feanturi, Lurch1985, SirusKing, tahu44
Industrial age themed expansion for Minecraft.
Logistics Pipes by davboecki, AartBluestoke, ArtForz, GUIpsp, theZorro266
Logistics Pipes is an extensive overhaul of the Buildcraft pipe system. It allows for better distribution of items via pipes, more organised stockkeeping and easier automated crafting.
MineFactory Reloaded by PowerCrystals, TehKrush, AtomicStryker, Feanorith, skyboy026
Power Converters by PowerCrystals, TehKrush, AtomicStryker, skyboy026
The Power Converters mod allows the player to easily convert energy from one form to another.