More Structures
ClothierEdward

Adds several new structures to make your world more alive.

Wilhelmines Natural Biomes
Liil

Adds 9 new biomes

Hallelujah Mountains (AKA Cloudlands)
DrFrankenstone

Giant rocks floating suspended in magnetic eddies. (skylands, islands, fantasy, giant trees)

Ocean
StarNinjas

Adds coral reefs, fish, decorative ocean blocks and much more!

Baked Clay
TenPlus1

Adds the ability to bake clay into blocks and colour them with dye.

Biome Lib
mt-mods

The biome spawning and management library.

Randungeon
Phii

adds highly randomized vivid dungeons to the world, and tools to spawn/customize them.

Australia
demon_boy

Adds a wide variety of Australia-themed biomes and content

Algae
Just_Visiting

Algae mapgen addition to "Minetest Game"

Extra Structures for Mineclonia/VoxeLibre
mt-mods

Adds extra structures to MineClone2

Wilhelmines Marinara
mt-mods

adds water structures and coral reefs to the oceans of your world

Native Villages
Liil

Adds villages of native people to the world.

VoxeLibre Skyblock
ancientmariner

Skyblock for VoxeLibre

Giant Mushroom/ Mushrooms
Hybrid Dog

Add mushrooms and giant mushrooms.

Rail Corridors + Treasures
Wuzzy

Adds simple underground mines with railways and occasional treasure chests.

Shipwrecks
mt-mods

A simple mod that adds various shipwrecks with treasures into the ocean

Natural Habitat
Mish7913

Adds more Plants and Biomes to the game.

Technic Plus Beta
mt-mods

The technic modpack extends the Minetest game with many new elements, mainly constructable machines and tools.

Better Biomes by Atlante
Neuromancer

This mod adds some of the subtle understated beauty of nature to your biomes to make the world look more natural. It was created by Atlante.

Dense Ores
benedict424

Adds rare ores with twice the drops of their normal counterpart.

Amethyst
alerikaisattera

Amethyst, basalt, calcite and related building blocks

Livingcaves
Liil

Adds more life to the caves of your world

Shallow Ores
Monniasza

Places ores shallower in your world! No more time wasted digging!

Stone Age Integration Pack
csirolli

Adds basic stone age & survival tools and makes the start in the world harder

Dungeon flora
rnu

Adds flora to cobblestone dungeons

Mineclone2 Underwater Challenge
NO11

A survival challenge for Mineclone2. Try to survive in a flooded world.

Large Slugs
jwmhjwmh

Adds node-based slug mobs to your world

Biospheres
Feufochmar

A map generator generating single-biome islands inside glass spheres.

Swamps
Hybrid Dog

Adds swamps

Multiple Biome Generator
chaosomnium

230 Pseudorandomly Generated Biomes, Trees, Fruits, Ores, Tools, and Liquids

Ore Deposits
Tarruvi

Adds ore deposits that can randomly spawn on stone

3d ores!
Soundwavez

a slick new take on the default ores!

Stone Chests
AwesomeDragon97

Replaces the wooden chests found in dungeons with stone chests.

Just a Mountain
Deadlock

Adds a Mountain (4000x2000 blocks large, 1000 blocks tall)during worldgen around a configurable position

The Lower Road
Deadlock

Adds a long road from -Z to +Z to the world, during world-generation.

NodeCore Cats
Warr1024

Add adorable cats to NodeCore

Datatest
dibesfer

8 new biomes with nodes, ores and schematics, inspired by digital data

pilzmod
Phii

a spreading mushroom biome which you can spawn into the world, with its own monsters and a boss you need to slay to stop the biome's growth. Best played with bow & armor mod and after reading manual.

Unter Null
Casimir

You start swimming in the middle of an infinite ocean. Take your time and build.

Sunset Biomes
RisingLeaf

Adding two biomes and stuff around them.