As you may know, the shack pack consists of a bunch of random mods that we found or liked. Unfortunately, because of imcompatibility between the mods, we couldn't input all of the mods we liked. Here's the entire list of mods:

SuperheroesUnlimited, SmartCursor, VeinMiner, TubeTransportSystem, TorchLevers, Tinkers' Construct, StarMiner, SecretRooms, Recipes+,

PortalGun(optional & requires manual installation. all explained on the portal gun page by DrShnig), MooFluids, ModTweaker2 and MineTweaker 3 (to boost performance levels), MalisisDoors, MagicalCrops, Jabba, IronChest, GraveStone, ExtraUtilities, ExNihilo, ExAstris, DraconicEvolution, Chisel2, CarpentersBlocks, AppliedEnergistics, ComputerCraft, LootBags, UsefulPets, MapWriter, LuckyBlock, GeoChests and BetterDungeons(ChocolateQuest); we recently added new mods: EnderIO, Biblio craft, Armor display and Enhanced Portals 3.

P.S. Updates may not be coming soon, as it is released only recently.