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Valleys Mapgen
Gaël de SaillyA map generator with valleys, rivers, mountains and many plants.
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Hallelujah Mountains (AKA Cloudlands)
DrFrankenstoneGiant rocks floating suspended in magnetic eddies. (skylands, islands, fantasy, giant trees)
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Dwarf Fortress style caverns
FaceDeerAdds vast underground caverns in the style of Dwarf Fortress, complete with underground flora in diverse biomes.
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Sedimentology
sofarA mod that adds realistic erosion and degradation of rocks.
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Magma Conduits
FaceDeerRemoves default mapgen lava and adds widely-spaced vertical lava "veins".
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Nether
PilzAdamAdds a deep underground realm with different mapgen that you can reach with obsidian portals.
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Quartz
EvergreenAdds quartz ore and some decorative quartz blocks
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Fireflies
SharaAdds fireflies which can be caught in a net and placed in bottles for lighting.
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Tac Nayn
GreenXenithAdds Nyan Cat's evil twin, Tac Nayn (and a gray-scale rainbow).
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Caverealms
HeroOfTheWindsA mod for Minetest to add underground realms.
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Caverealms Lite
SharaA mod for Minetest to add underground realms.
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Technic
RealBadAngelExtensive machinery mod with electricity and ores.
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More Ores
CalinouAdds new ore types.