HarborCraft has a variety of mod types to look into, you can be a scientist with the IndustrialCraft and BuildCraft mods, or you can look into the books with magic! Survive by growing your own food with Pam's Harvestcraft or hunt with some weapons from Tinkers' Construct! You can also check out some of the not-so-familiar mods like PneumaticCraft or Rustic and get a new experience in Minecraft!

Mods:

Pam's HarvestCraft (by MatrexsVigil)
Pam's Get All the Seeds! (by MatrexsVigil)
JourneyMap (by techbrew)
Iron Chests (by progwml6)
Just Enough Items (JEI) (by mezz)
Mantle (by mDiyo)
Tinkers Construct (by mDiyo)
Inventory Tweaks (by Kobata)
Mouse Tweaks (by YaLTeR97)
Morpheus (by Quetzi)
CodeChicken Lib 1.8.+ (by covers1624)
Redstone Flux (by TeamCoFH)
CoFH Core (by TeamCoFH)
CoFH World (by TeamCoFH)
Thermal Foundation (by TeamCoFH)
Thermal Expansion (by TeamCoFH)
Actually Additions (by Ellpeck)
BiblioCraft (by JDSinclair)
Baubles (by azanor)
Botania (by Vazkii)
Extra Utilities (by RWTema)
ConnectedTexturesMod (by tterrag1098)
Chisel (by tterrag1098)
Chameleon (by jaquadro)
Storage Drawers (by jaquadro)
OpenComputers (by SangarWasTaken)
Iron Backpacks (by gr8pefish)
Thermal Dynamics (by TeamCoFH)
Brandon's Core (by brandon3055)
Draconic Evolution (by brandon3055)
Forestry (by SirSengir)
McJtyLib (by McJty)
RFTools (by McJty)
Tinkers' Tool Leveling (by bonusboni)
Guide-API (by TehNut)
Blood Magic (by WayofTime)
Wawla - What Are We Looking At (by Darkhax)
Industrial Craft (by Player)
RFTools Dimensions (by McJty)
Magic Bees (by MysteriousAges)
Hwyla (by TehNut)
Waila Harvestability (by squeek502)
Roots (by elucent)
Thermal Cultivation (by TeamCoFH)
Waystones (by BlayTheNinth)
Rustic (by mangoose3039)
Immersive Tech (by ferroo2000)
Immersive Engineering (by BluSunrize)
More Overlays (by feldim2425)
Thaumcraft (by azanor)
AbyssalCraft (by Shinoow)
FTBLib (by FTB)
YABBA (by LatvianModder)
NuclearCraft (by TLJGames)
PneumaticCraft: Repressurized (by desht)
Bonsai Trees (by Davenonymous)
MrTJPCore (by Mr_TJP)
Forge MultiPart CBE (by covers1624)
Project Red - Base (by Mr_TJP)
Project Red - Integration (by Mr_TJP)
Project Red - Lighting (by Mr_TJP)
Project Red - World (by Mr_TJP)
Project Red - Mechanical (by Mr_TJP)
Project Red - Compat (by Mr_TJP)
VeinMiner (by Portablejim)
ICBM - Classic (by darkguardsman)
Buildcraft (by CovertJaguar)
Signals (by MineMaarten)

HarborCraft

AbyssalCraft

Actually Additions

Advanced Generators

Baubles

BdLib

BiblioCraft

Blood Magic

Bonsai Trees 4

Botania

Brandon's Core

Buildcraft

CB Multipart

Chameleon

Chisel

ChocoCraft

CodeChicken Lib 1.8.+

CoFH Core

CoFH World

ComputerCraft

ConnectedTexturesMod