IC2 (industrial craft 2) with many other metals like tin, copper, sliver. Besides, there are electricity, wires, solar panels, etc. Moreover, there are many many machines for crafting more and more things. Furthermore, you can make a item called "uu-matter". It can be crafted to make many things, such as diamonds! Last but not least, you can make a super armor that is stronger than diamond and do not break! It only needs electricity! And It is very useful that you won't hurt although you jump from the highest point to the lowest point. You won't die if you fall under the bedrock too!
Try Mo Creatures, Pixelmon, Gulliver mod, Tinkers Construct. Look at Feed the Beast and Tekkit modpacks. I can give you a lot more when I'm at my house, if you want just email me @ email@example.com