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XNether
GhaydnAdds trees, grass and ores to PilzAdam's Nether
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Magma
SuperStarSonicAdds volcanoes, lava vents and new magma blocks
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Beautiful Boulders
regulusProcedurally Generated Rocks with (pretty) Accurate Collision Boxes
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Bamboo
AwesomeDragon97Adds bamboo which generates in jungles and can be used as a crafting ingredient.
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Generic moon of Saturn
Red_King_CyclopsReplaces the default earthlike setting with a generic moon of Saturn.
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New Biomes
ArkatronIf you like underground biomes, this thing is for you.
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New Horizons
Hi_WorldAdds 4 new biomes and TONS of new blocks!
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morebiomes
mzs.112000A simple mod adding a few biomes to Minetest Game
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Dirt Tunneler
NeuromancerMakes dirt deeper and you can tunnel through it just by walking through it. Press spacebar/shift to tunnel upward/downward with auto placed ladders.
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Tac Nayn
GreenXenithAdds Nyan Cat's evil twin, Tac Nayn (and a gray-scale rainbow).
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Randomized Map-specific Ores
Piezo_Adds two randomly created ores to each world with varying properties depending on the world's seed
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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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Trucraft
mt-modsAn alternative crafting system done entirely in the world.
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World Borders
argyleAdd impenetrable barriers to the sides and bottom of the world.
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Spawn redo
cathaya7d4Drop-in replacement for default/spawn for more third-party biomes
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Kitty/Kitto Ores
nemokitty9Nemokitty9's own ore pack. Includes Tools!
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treasures
ademantTreasure nodes with useful items
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Silver
Jackknifeadds silver ore and tools