User blog comment:TheblueWizard/concerning mods.../@comment-26172435-20160128181759

Odd that you didn't mention TerrainControl. I've used that for massive custom world generation for vanilla worlds. Still working on that ... a bit, while getting inspiration from the LOTR mod. :)

I also have experience with ATG and ClimateControl using our dark fantasy modpacks. ATG kinda didn't provide what I hoped it would give in combination with other biome generators. I also tested another, similar world generator, but can't recall it's name.

ClimateControl is brilliant in combination with BiomesO'Plenty, Highlands, Oceancraft, Thaumcraft and Vanilla biomes. The mods UndergroundBiomeConstructs and WildCaves also fit in this custom generator set.

As you're more or less looking into the subject, and in case you find references that may be of interest to this featured blog post by Hubtoo, don't hesitate to leave a note on that blog. ;)