Shallow Ores
Monniasza

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

Ore Deposits
Tarruvi

Adds ore deposits that can randomly spawn on stone

Multiple Biome Generator
chaosomnium

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

The Lower Road
Deadlock

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

Stone Chests
AwesomeDragon97

Replaces the wooden chests found in dungeons with stone chests.

Sunset Biomes
RisingLeaf

Adding two biomes and stuff around them.

Unter Null
Casimir

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

Cloud Items
Panquesito7

Powerful cloud tools.

Warning: Non-free media.

Wilhelmines Living Desert
Liil

Adds plants to the default deserts of minetest game.

Wilhelmines Living Floatlands
Liil

Adds various prehistoric animals to your Floatland Zone, if you are using V7 Map Generator.

Ruined structures
X-DE

Adds ruins to desert, sandstone desert, icesheet, snowy grassland, taiga, rainforest and tundra

Livingcaves
Liil

Adds more life to the caves of your world

Caverealms
HeroOfTheWinds

A mod for Minetest to add underground realms.

Fireflies
Shara

Adds fireflies which can be caught in a net and placed in bottles for lighting.

Easy ores
X-DE

Minetest ores now generate higher up

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.

Quartz
Evergreen

Adds quartz ore and some decorative quartz blocks

Deepslate
Silver Sandstone

Adds deepslate and related building materials.

Biospheres
Feufochmar

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

Nssb
TenPlus1

BIOME integration for nssm, the not so simple buildings.

Alien Material
debiankaios

Adds new blocks, items, and tools from aliens. A new time begins.

Magma Conduits
FaceDeer

Removes default mapgen lava and adds widely-spaced vertical lava "veins".

Badlands
AwesomeDragon97

Adds the badlands biome, which contains plentiful clay and gold.

block physics
GigaByte

Add pieces of broken blocks when breaking them.

NextGen Bedrock
StarNinjas

Adds an indestructible bedrock layer at the bottom of the world.

Geodes
AwesomeDragon97

Adds amethyst geodes and an API for making custom geodes.

Ancient Fertilizer
Daniel

Adds ancient fertilizer, sourced from ancient stone in the underground, useful for farming flowers if you need dye for colored nodes, complements bonemeal.

Just a Mountain
Deadlock

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

Coconut Trees
AwesomeDragon97

Adds coconut trees that appear on beaches

3d ores!
Soundwavez

a slick new take on the default ores!

Zinc
alerikaisattera

Zinc metal, used for making brass

In the Fog
Jo5629_

Herobrine has entered your world.

Zero-Effort Custom Minerals
Piezo_

A tool for registering entire materials, complete with ore generation, tool-sets and automatically generated sprites with almost no effort required

Swamps
Hybrid Dog

Adds swamps

Swamplified
Neuromancer

This mod adds a few more nice touches to Atlante's Swamp biome mod

UFO wreck
Irremann

UFO wreck

Sedimentology
sofar

A mod that adds realistic erosion and degradation of rocks.

Loose Rocks
eduardomezencio

Adds loose rocks which generate randomly on the surface.

Kitty/Kitto Ores
nemokitty9

Nemokitty9's own ore pack. Includes Tools!

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.