Alien Tools
chaosomnium

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

Underground Challenge
Hume2

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.

Bamboo
AwesomeDragon97

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

Easy ores
X-DE

Minetest ores now generate higher up

summer
ulla

SUMMER

New Biomes
Arkatron

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

Fragments
Amaz

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

Easter Eggs / Ostereier
Ineva

Adds various coloured eggs for Easter!

Too many ores
TeufloV

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