Draconis
ElCeejo

Adds Dragons and related resources and equipment to Minetest Game

Nether
PilzAdam

Adds a deep underground realm with different mapgen that you can reach with obsidian portals.

Loria (alpha)
siegment

Survival in hardcore acid-alien sci-fi themed world

Hades Revisited
Wuzzy

You have stranded on the planet Hades. Use your limited supplies to survive and use terraforming to create a beautiful habitable place. (EARLY TEST VERSION)

XaEnvironment
AiTechEye

A game that aims to contain lots of environments and things.

Native Villages
Liil

Adds villages of native people to the world.

Alien Material
debiankaios

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

Mineclone2 Nether Gold Ore
NO11

Adds Nether Gold Ore

Multiple Biome Generator
chaosomnium

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

Grave
ElCeejo

Adds an eerie biome with multiple mobs.

Base Modpack
karlexceed

This combines several other mods that I consider a basic minimum starting point for worlds.

Underground Challenge
Hume2

Explore all 62 underground biomes!

Sailing
cakenggt

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

Trucraft
PolySaken

An alternative crafting system done entirely in the world.

NodeCore Lignite
Winter94

Adds Lignite, an ore of coal.