Amidst

Amidst is a tool to display an overview of a Minecraft world, without actually creating it.

Amidst can:

render an overview of a world from a given seed and Minecraft version save an image of the map use a save game display biome information display slime chunks display end islands display the following structures world spawn strongholds villages witch huts pillager outposts jungle temples desert temples igloos abandoned mine shafts ocean monuments ocean ruins shipwrecks buried treasures nether fortresses end cities

Amidst cannot:

display changes that were applied to a save game like changes made by world editors like MCEdit changes made while loading the world in Minecraft find individual blocks or mobs like diamond ore cows