terrafirmacraft, it's a pretty complex (and buggy) mod
I don't think it's buggy. But God damn it's brutal.
The pit kiln update(s) however made it 200% easier since you don't have to get into the more complex crafting mechanics to do stuff, which is actually kind of sad.

I only wish it was included in a Launcher because installing it by hand is kinda meh-y.