The mods in The Epic Mod Pack are always changing as new versions of the pack are released. Here is a list of the mods that are currently or have been in the mod pack. New ones can always be added, and old ones can always come back, so no mod listing will be removed even if the mod comes out of the pack.
Extra Biomes XL
Metallurgy 2 (Core, Base, Nether)
Flan's Mod (biplanes)