More Nether Ores by GoodMiner
This mod adds new ores and block in the Nether with more tools and materials.
worldgen tools survival
Nether Ores by PowerCrystals, TehKrush, AtomicStryker, skyboy026
Introduces mineable yet dangerous ores to the Nether
worldgen
Ruins Spawning System by AtomicStryker, d00dv4d3r, kolt666, 4HeadTiger, Blue001
Allows highly customizable Structure Templates to randomly generate in your Worlds
worldgen dungeons
WorldAndGenerationTweaks by Thebombzen
WorldAndGenerationTweaks provides various assorted tweaks to terrain generation.
worldgen tweak