PneumaticCraft is a technical mod all about pneumatics. Apart from a power system based on that of real life, it adds all kinds of tools and gadgets, like Drones, which you can program to do all sorts of tasks for you, or a Pneumatic Helmet, which gives you a Iron Man like HUD.
The mod adds full support for the In-Game Wiki mod, it is highly recommended to also download that mod: http://minecraft.curseforge.com/mc-mods/223815-in-game-wiki-mod
A 1.12.2 port of the mod has been done by desht and I, called PneumaticCraft: Repressurized. You can find it here! https://minecraft.curseforge.com/projects/pneumaticcraft-repressurized