Buildcraft is a full featured modification for Minecraft that adds automated building, mining and crafting as well as pipe transport and item sorting to the Minecraft experience.
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Industrial Craft you can create obstacle courses of Metal Poles and Rubber-Sheets, explore the Nether with an Electrical Jetpack or blow up whole landscapes at once by using the Dynamite-O-Mote.
Or discover the much more complex mechanisms of Nuclear Engineering, blow up your hut or burn your hands.
Or grab the rusty ol' Composite Vest, and start hunting Creepers with the new, all-mighty NanoSaber.
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Minecraft Forge is a server and client Minecraft API that enables mods to be compatible with each other and provides modding capabilities for modders.