Ars Planet
A world built from first principles — a star, an orbit, a crust that moves, weather that follows from it, rivers that follow from that — and drawn at the end as county maps in the manner of John Speed.
How it works
Name a world and pick how much of it you want to decide yourself. Four paths run from Basic, where you make the headline call at each stage and the rest is rolled, to Expert, where nothing is hidden. Every world runs the whole pipeline either way — the path only decides how much you are asked about.
The pipeline is being built stage by stage, beginning with the galaxy the world forms in and ending with the county maps.