There are currently 15 dimensions, 2 creative tabs, 3 achievement tabs (and an astronomical amount of achievements), a lot of new ores and gems, 7 machines, some new mobs, new structures, and much much more. JEI is highly recommended here.
I've been working on this in private by myself for a while, but it's about time I share it.
There is so much in here to explore and find that you never get bored.
AND THERE IS STILL MORE THAT WILL BE ADDED!
This is also available on MCreator.
Keep that in mind because I update there more frequently than I do here, so updates here will take longer.