UFO wreck
Irremann

UFO wreck

Swamps
Hybrid Dog

Adds swamps

Dyes for Extra Biomes
Skivling

Deprecated because after ebiomes v1.5.0, dye recipes are included by default, making this unnecessary. Adds dye recipes for the flowers from Extra Biomes.

Giant Mushroom/ Mushrooms
Hybrid Dog

Add mushrooms and giant mushrooms.

Chemistry
Emiliano

A package that adds More Ores and Things

XNether
Ghaydn

Adds trees, grass and ores to PilzAdam's Nether

Nether addons
DragonWrangler

adds more nodes and decorations to the nether

Underground Challenge
Hypernoot

Explore all 62 underground biomes!

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.

Easy ores
X-DE

Minetest ores now generate higher up

Bamboo
AwesomeDragon97

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

Dragonbone Stuff
Robot10&Scheletor

Adds dragonbone set

summer
ulla

SUMMER

Alien Tools
chaosomnium

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

Startest
Robot10&Scheletor

This mod adds several space stuff to the game.

My Ores
Don

Adds ores and minerals to Luanti

Fragments
Amaz

A mapgen with a goal, with things needed to advance to the next level.

Advanced Biome Decoration Modpack
EmptyStar

A collection of advanced biome decorations

New Biomes
Arkatron

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

Noriel Sylvire's Minerals Core Modpack
Noriel_Sylvire

An API for automatically registering recipes, nodes and ore generation.

Sun Flowers
Hybrid Dog

This mod generates flowers which close their heads at night.

Easter Eggs / Ostereier
Ineva

Adds various coloured eggs for Easter!

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.

Obdy
Sires

Adds some pretty OP tools :)

Too many ores
TeufloV

This adds 53 new ores. But most of them are useless.