A themed pack without quests or achievements, instead a different approach to modded Minecraft beyond the single block solutions so common now. Several new mods, plus a few more familiar. Relax, have fun and try something outside of your usual experience.

Documentation:

There are a lot of new and unfamiliar mods here. NEI will handle most of your questions and the In Game Wiki covers Hydraulicraft, Open Modular Turrets, and Pneumaticraft. A few others have in game guides, Chromaticraft, Essential Craft 3, immersive Engineering.

Out of game wikis and information:
Advance Generators: http://bdew.net/generators/
Engineer's Toolbox: http://spearmanstudios.com/mods/handbook/et-handbook-1.0.0.pdf
Fancy Fluid Storage: https://ffs.lordmau5.com/
Magneticraft: http://www.minecraftforum.net/forum.../minecraft-mods/wip-mods/2294740-magneticraft
Matter Overdrive: http://simeon.co.vu/Mods/MatterOverdrive/
NuclearCraft: http://nuclearcraft.wikia.com/wiki/Main_Page
Silent's Gems: http://minecraft.curseforge.com/mc-mods/220311-silents-gems

Mod List:

Modular Mayhem

Advanced Generators

AE2 Stuff

Another One Bites the Dust

Applied Energistics 2

Aura Cascade

Baubles

BdLib

BiblioCraft

Carpenter's Blocks

Catwalks 2

Chisel

ChromatiCraft

CodeChickenCore

CoFH Core

Darkcore

Decocraft

DragonAPI

DrCyano's Lootable Bodies

DummyCore

EnderCore