It will probably be of interest mainly to gamers that like OSR RPGs.
It runs at http://meta-studios.com/dg/dungen.html. Discussion is mostly on G+ and my Ruminations of a Geek blog linked at the top of the app page.
DunMap is a second page that shares most of the same JS code. You load a bitmap image of the map and place markers by clicking on it. It generates contents for each marker as it is created. http://meta-studios.com/dg/dunmap.html
Both allow editing of previously generated content and in browser storage using LocalStorage, giving a lightweight UI for quickly building paper and pencil dungeon crawls.