Geodes
AwesomeDragon97

Adds amethyst geodes and an API for making custom geodes.

NextGen Bedrock
StarNinjas

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

Alien Material
debiankaios

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

3d ores!
Soundwavez

a slick new take on the default ores!

Ore Deposits
Tarruvi

Adds ore deposits that can randomly spawn on stone

Coconut Trees
AwesomeDragon97

Adds coconut trees that appear on beaches

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

Loose Rocks
eduardomezencio

Adds loose rocks which generate randomly on the surface.

Sedimentology
sofar

A mod that adds realistic erosion and degradation of rocks.

Sailing
cakenggt

Live in a tropical paradise where you can sail, mine coconuts, etc.

Meze
Calinou

A special ore that kills you when mined.

Boring RPG
Lebedev

New items blocks and other pieces are waiting for you here

Grave
ElCeejo

Adds an eerie biome with multiple mobs.

Giant Mushroom/ Mushrooms
Hybrid Dog

Add mushrooms and giant mushrooms.

Wilhelmines Living Desert
Liil

Adds plants to the default deserts of minetest game.

XNether
Ghaydn

Adds trees, grass and ores to PilzAdam's Nether

My Treasure
Don

Adds treasure chests around the world

Bamboo
AwesomeDragon97

Adds bamboo which generates in jungles and can be used as a crafting ingredient.

My Ores
Don

Adds ores and minerals to Luanti

Time Travel
Red_King_Cyclops

Adds in a craftable time machine that can be used to time travel to different time periods of Earth's history.

Valleys Mapgen
Gaël de Sailly

A map generator with valleys, rivers, mountains and many plants.

Winuser Leafdecay
Liil

With this additiona leaf decay, all trees in naturalbiomes, livingdesert, livingjungle and livingfloatlands have a working leafdecay function.

Underground Challenge
Hume2

Explore all 62 underground biomes!

Ancient Ice Stuff
Robot10&Scheletor

Adds a new powerful ore to the game

Wildflower Fields
mzs.112000

Adds a wildflower field biome to Minetest Game.

Magma
SuperStarSonic

Adds volcanoes, lava vents and new magma blocks

Quartz Geodes
AwesomeDragon97

Extends the Geodes mod with quartz geodes.

Ancient Bones
karlexceed

Adds bones with loot to dungeons.

Generic moon of Saturn
Red_King_Cyclops

Replaces the default earthlike setting with a generic moon of Saturn.

Advanced Biome Decoration Modpack
EmptyStar

A collection of advanced biome decorations

Herbs
Clyde

Adds 15 flowers and 6 mushrooms.

Archaeology
SkyBuilder1717

Adds an looting and API in archaeologing

Easter Eggs / Ostereier
Ineva

Adds various coloured eggs for Easter!

New Horizons
Hi_World

Adds 4 new biomes and TONS of new blocks!

Kitty/Kitto Ores
nemokitty9

Nemokitty9's own ore pack. Includes Tools!

Startest
Robot10&Scheletor

This mod adds several space stuff to the game.

Purple ore
X-DE

Adds new purple ore to floating islands and caves from height 200 to 31000.

Alien Tools
chaosomnium

Alien Tools Mod for Minetest - adds Alien Tool, Shield, biome, etc

New Biomes
Arkatron

If you like underground biomes, this thing is for you.