I would really, really suggest you to use these mods - they don’t add content persay, but nice features:
Personally, I love the additions in these mods (only keeping an eye on the mods for now, but will use them soon):
This might be of your liking, too (again, nothing I’ve played with myself):
Some mods that seem to add more advanced stuff (I have not tried these mods myself):
That’s just the ones from the top of my head - I’m sure you’ll find some great ones out there 