Nether
PilzAdam

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

XaEnvironment
AiTechEye

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

Alien Material
debiankaios

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

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)

Draconis
ElCeejo

Adds terrifying Dragons and powerful equipment.

Underground Challenge
Hume2

Explore all 62 underground biomes!

Grave
ElCeejo

Adds an eerie biome with multiple mobs.

Loria (alpha)
siegment

Survival in hardcore acid-alien sci-fi themed world