Thaumcraft 6, and every possible addon I could download for it without downloading trojan horse viruses. Some I can remember are like thaumic augmentations and thaumic gadgets, thaumic energistics, thaumic brewing, rustic thuamaturgy, thaumic wonders, thaumic lost magic, thaumcraft inventory scan, thaumic bases, thaumic tinkerer. there is also the aether, dimensional doors, the twighlight forest, and some desert dimension. It is very fun to progress through it all