Ultima Ratio Regum [official site] is like the world generation side of Dwarf Fortress, except zoomed in a little and with more attention paid to the specifics of cultures rather than the verging-on-cosmic legendary events of the past. It’s a game that procedurally generates civilisations, faces, cities, religions, clothes and symbols. Perhaps it’s wrong to describe it as a game at present, actually, as the April 2016 release of version 0.8 will be the first “gameplay release”. At the moment, it’s a tool (or series of tools) that create worlds and the people who inhabit those worlds.
The latest work involves procedural castles and they look amazing.