Mods

Mekanism

IndustrialCraft 2

Buildcraft

BiomesOPlenty

Aether

Galacticraft

Traincraft

Twilight Forest

Tinker's Construct

Factorization (Deprecated in 1.1)

Jurassic Craft

MC Heli

Backpack

NotEnoughItems

Waila

Journey Map

Computercraft (Added in 1.1)

MineFactory Reloaded (Added in 1.1)

MineTweaker (Added in 1.1)

Tropicraft (Added in 1.2)

Wireless Redstone (Added in 1.2)