A game that changes much of MTG's gameplay.
Multiple Biome Generator
230 Pseudorandomly Generated Biomes, Trees, Fruits, Ores, Tools, and Liquids
Survival in hardcore acid-alien sci-fi themed world
You Can't Touch It Either
Simple mod adding lockable storage shelves to Nodecore.
This combines several other mods that I consider a basic minimum starting point for worlds.
Portals and stuff
Draw power from the world, and use it to power machines and tools.