Draconis
ElCeejo

Adds terrifying Dragons and powerful equipment.

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)

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

Alive AI
AiTechEye

Advanced survivor ai mobs (npc, monsters and more)

Nether
PilzAdam

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

NodeCore Lignite
Winter94

Adds Lignite, an ore of coal. Now outdated, please use NodeCore Coal instead. See Below.

Trucraft
mt-mods

An alternative crafting system done entirely in the world.