In the Heart of the Delve & Dangerous – Procedural point crawl adventure engine for exploring a network of interconnected spaces - e.g. dungeons, space stations or eldritch structures
Basically, in In the Heart of the Delve and Dangerous there are two 'game engines' in the form of Hex Flowers. One engine drives locations and the other the encounters.
Each time you move to a new location, you procedurally determine what is there.