Livingcaves
Liil

Adds more life to the caves of your world

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.

Amethyst
alerikaisattera

Amethyst, basalt, calcite and related building blocks

Shallow Ores
Monniasza

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

Just a Mountain
Deadlock

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

Stone Age Integration Pack
csirolli

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

Stone Chests
AwesomeDragon97

Replaces the wooden chests found in dungeons with stone chests.

The Lower Road
Deadlock

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

Ore Deposits
Tarruvi

Adds ore deposits that can randomly spawn on stone

Biospheres
Feufochmar

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

3d ores!
Soundwavez

a slick new take on the default ores!

Swamps
Hybrid Dog

Adds swamps

Unter Null
Casimir

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

Multiple Biome Generator
chaosomnium

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

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.

Sunset Biomes
RisingLeaf

Adding two biomes and stuff around them.

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

Chemistry
Emiliano

A package that adds More Ores and Things

Nssb
TenPlus1

BIOME integration for nssm, the not so simple buildings.

Caverealms
HeroOfTheWinds

Adds underground realms.

block physics
Giga_M

Add pieces of broken blocks when breaking them.

Quartz
Evergreen

Adds quartz ore and some decorative quartz blocks

Magma Conduits
FaceDeer

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

Fireflies
Shara

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

In the Fog
Jo5629_

Herobrine has entered your world.

Badlands
AwesomeDragon97

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

Deepslate
Silver Sandstone

Adds deepslate and related building materials.

Easy ores
X-DE

Minetest Game ores now generate higher up

NextGen Bedrock
StarNinjas

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

Underground Challenge
Hypernoot

Explore all 62 underground biomes!

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

Alien Material
debiankaios

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

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.

Sedimentology
sofar

A mod that adds realistic erosion and degradation of rocks.

Geodes
AwesomeDragon97

Adds amethyst geodes and an API for making custom geodes.

Lapis Lazuli
LNJ

Adds lapis lazuli ore, items and blocks.

Swamplified
Neuromancer

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

Kitty/Kitto Ores
nemokitty9

Nemokitty9's own ore pack. Includes Tools!