These stories take place in what-if, often dystopian visions of a future planet Earth.
The Summer Prince by The steampunk genre is characterized by inventions that are either ficititious or out-of-sync with the historical setting of the story. Sometimes there are also supernatural elements involved. Generally there are a lot of steam-powered devices, clockwork, and corsets.
Worldshaker by 
Found by 
The Hitchhiker's Guide to the Galaxy by 
