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Nether
PilzAdamAdds a deep underground realm with different mapgen that you can reach with obsidian portals.
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Too Many Stones
JoeEnderman88 stones that will spawn in most games. Supports English, Español, Français, Deutsch, Pусский, Português, 日本語
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Everness
SaKeLAdds many new biomes, items and blocks.
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Underground Challenge
Hume2Explore all 62 underground biomes!
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Underground Survival Lighting
ArkatronIf you like underground light in survival, use this mod, it can help that.
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Geodes
AwesomeDragon97Adds amethyst geodes and an API for making custom geodes.
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Amethyst
alerikaisatteraAmethyst, basalt, calcite and related building blocks
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Technic Plus Beta
mt-modsThe technic modpack extends the Minetest game with many new elements, mainly constructable machines and tools.
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Asuna
EmptyStarA vibrant world of beautiful biomes. Explore, discover, create.
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More Ores
CalinouAdds new ore types.
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Modgen
BuckarooBanzaimapgen mod creator
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Randungeon
Phiiadds highly randomized vivid dungeons to the world, and tools to spawn/customize them.
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Zinc
alerikaisatteraZinc metal, used for making brass