Galacticraft, Tinkers' construct, and Orespawn. (In that order) Links to the mod pages are included.

Galacticraft - In space, nobody can hear you craft... Galacticraft allows you to travel to other planets, build homes on those planets, and even make your own satellites!

Tinkers' Construct - This mod allows you to build a smeltery, get double ores, and make so many more tools!

Orespawn - Orespawn is a combat based mod that adds more (much harder) bosses, dimensions, stronger enemies, swords that do 750 damage, a pet that actually grows, (and eventually becomes the second hardest boss, unless you leave that config option alone) and ores that can be turned into spawn eggs. (Hence the name)

orespawn

world edit, conquest reforged oviously

AND, anything from "ichun"
and tinkers construct

Conquest Reforged and WorldEdit

Conquest Reforged is a mod with over 8000 textures and 3D models.

WorldEdit is an easy-to-use in-game Minecraft map editor. Through a combination of commands and "brushes", you can sculpt your world or simply perform numerous terraforming tasks.