We Them Mechanics

Buildcraft by CovertJaguar and buildcraftchildsplay

 - A mod that has existed for many years and still provides good automation and good machinery.

 - The mod is based around Redstone Flux (RF in short) and has multiple ways to produce it.

Thermal Expansion by TeamCOFH, King Lemming, skyboy026 and Zeldo

 -  Another mod based around Redstone Flux and adds tons of different machines and can compared       to Industrialcraft.

 - Provides ways to store and transport items/RF/Fluids.

EnderIO

 - Another mod based around Redstone Flux and does pretty much the same things as Thermal Expansion but differently.

 - Provides another way to transport and store Items, RF and Fluids.

 - They have a specfic and very cool thing with their way to transport Items, RF and Fluids. All the pipes can be stuffed into the space of one block.

Pam's Harvestcraft by MatrexsVigil

 - Most downloaded food mod on Curse with 14 million downloads

 - It provides many different (60+) new crops which are obtainable from Trees, Gardens and more. 

 - Provides good fun especially in conjunction with other mods in this modpack such as EnderIO and        Buildcraft which can automate the process.

This pack contains Fastcraft, by Player, enabled by default. Fastcraft enhances Minecraft with increased performance. Bug reports being made directly to Mod Authors should state Fastcraft is enabled. More informations can be found here: http://forum.industrial-craft.net/index.php?page=Thread&threadID=10820