Here's plenty of structures, mobs, and dungeons to wear out your sword. If you find the time send a word of thanks to all below who work hard to make a great game even greater!

JourneyMap (by techbrew)
Just Enough Items (JEI) (by mezz)
Mantle (by mDiyo)
Tinkers Construct (by mDiyo)
Construct's Armory (by theillusivec4)
CodeChicken Lib 1.8.+ (by covers1624)
Ancient Warfare 2 (by shadowmage45)
Tinkers' Tool Leveling (by bonusboni)
FTBLib (by FTB)
FTB Utilities (by FTB)
AutoRegLib (by Vazkii)
Quark (by Vazkii)
Mouse Tweaks (by YaLTeR97)
Gravestone mod - Graves (by NightKosh)
Gravestone mod - Extended (by NightKosh)
Roguelike Dungeons (by Greymerk)
Dungeon Tactics (by PegBeard)
Chance Cubes (by turkey2349)
Electroblob's Wizardry (by electroblob)
Redstone Flux (by TeamCoFH)
Brandon's Core (by brandon3055)
Draconic Evolution (by brandon3055)
BetterFps (by Guichaguri)
FoamFix for Minecraft (by asiekierka)
OMLib (by Keridos)
OpenModularTurrets (by Poenjabiesous)
Immersive Engineering (by BluSunrize)
Immersive Petroleum (by theFlaxbeard)
stimmedcow : NoMoreRecipeConflict (by Oliv1er)
IvToolkit (by Ivorforce)
Recurrent Complex (by Ivorforce)
Ruins (Structure Spawning System) (by AtomicStryker)
Multi Mob Library (by Daveyx0)
Primitive Mobs (by Daveyx0)
Dungeon Mobs Reborn (by Sunconure11)
Grimoire of Gaia (by Silentine)
Wawla - What Are We Looking At (by Darkhax)
SimpleHarvest (by TehNut)
OresAllEasy (by osheaven)
Heat And Climate Lib (by defeatedcrow)
Heat And Climate (by defeatedcrow)
Silent Lib (by SilentChaos512)
Extended Days (by SilentChaos512)
Hwyla (by TehNut)
Waila Harvestability (by squeek502)
Tree Chopper (by DuchLord)
Fast Leaf Decay (by Olafskii)
Biomes O' Plenty (by Glitchfiend)
TidyChunk (by OreCruncher)
Prefab (by WuestMan)
Cyclops Core (by kroeser)
EvilCraft (by kroeser)
Custom Starter Gear (by brandon3055)
Chunk-Pregenerator (by Speiger)

Oinkosoft Fight Pack

Ancient Warfare 2

AutoRegLib

BetterFps

Biomes O' Plenty

Brandon's Core

Chance Cubes

Chunk-Pregenerator

CodeChicken Lib 1.8.+

Construct's Armory

Custom Starter Gear

Cyclops Core

Draconic Evolution

Dungeon Mobs Reborn

Dungeon Tactics

Electroblob's Wizardry

EvilCraft

Extended Days

Fast Leaf Decay

Foam​Fix

FTB Library (Forge) (Legacy)

FoamFix