Survival addition throug tough as nails combined with many new food recipes by farmers delight and croptopia. Early and late game addons to survive the heat/cold better.
Become major of your own city with mine colonies.
Build automated machines with create and a ton of addons.
Build controllable trains, ships and aircrafts with functioning cannons.
Craft your very own tools and armors with tinkers construct.
Explore new dimensions through the just stargate system.
Interesting world exploration with many new structures and biomes.
Realistic trees with passable leaves.
Build what you want with many new blocks from macaws, and wireless/tiny redstone
And dozens of quality of life and grafics optimization.