XNether
Ghaydn

Adds trees, grass and ores to PilzAdam's Nether

Basic Houses
Sokomine

Simple random houses spawning in small groups on the map

Mineclone Better End
TX Miner

Make the end better in Mineclonia and Mineclone!

Chemistry
Emiliano

A package that adds More Ores and Things

Ruined structures
X-DE

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

Nether addons
DragonWrangler

adds more nodes and decorations to the nether

Biome generator for Lua mapgens
Gaël de Sailly

Library to provide biomes and decorations for compatible Lua mapgens.

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.

VoxeLibre caves
Noordstar

Custom caves in VoxeLibre

Underground Challenge
Hume2

Explore all 62 underground biomes!

Lapis Lazuli
LNJ

Adds lapis lazuli ore, items and blocks.

Cave Generator
Noordstar

A custom cave generator engine

Lucky Block Ore
ems111

Adds Lucky Block ores to world.

Winuser Leafdecay
Liil

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

Valleys Mapgen
Gaël de Sailly

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

Generic moon of Saturn
Red_King_Cyclops

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

Ancient Ice Stuff
Robot10&Scheletor

Adds a new powerful ore to the game

Indestructible Bedrock Layer
Wuzzy

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

Magma
SuperStarSonic

Adds volcanoes, lava vents and new magma blocks

Herbs
Clyde

Adds 15 flowers and 6 mushrooms.

Bamboo
AwesomeDragon97

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

Mapgen Superflat
DragonWrangler

Makes your world super flat

My Treasure
Don

Adds treasure chests around the world

Quartz Geodes
AwesomeDragon97

Extends the Geodes mod with quartz geodes.

Ancient Bones
karlexceed

Adds bones with loot to dungeons.

Wildflower Fields
mzs.112000

Adds a wildflower field biome to Minetest Game.

Mob BiomeDb Mapper
Neuromancer

Allows mobs to spawn in biomes that don't support them (Using info from BiomeDb)

Exile Rails
programmerjake

Adding underground rails and trains to Exile

Elephant Veins
jan Epiphany

Replaces small, sporadic ore pockets with sparse, gigantic ore veins.

Advanced Biome Decoration Modpack
EmptyStar

A collection of advanced biome decorations

Unstable Caves
M BLOC

Some stones may cave in if punched, making underground expeditions more risky.

Startest
Robot10&Scheletor

This mod adds several space stuff to the game.

Dirt Tunneler
Neuromancer

Makes dirt deeper and you can tunnel through it just by walking through it. Press spacebar/shift to tunnel upward/downward with auto placed ladders.

Sun Flowers
Hybrid Dog

This mod generates flowers which close their heads at night.

Zinc
alerikaisattera

Zinc metal, used for making brass

Archaeology
SkyBuilder1717

Adds an looting and API in archaeologing

NodeCore SeaLife
Winter94

Adds Biodiversity to NodeCore Seas & Rivers

Alien Tools
chaosomnium

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

Natural slopes for Hades Revisited
karamel

Add natural slopes for Hades Revisited

New Biomes
Arkatron

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