Those are called "railroad diagrams". I don't have a specific recommendation, but this should get you started: http://stackoverflow.com/questions/773371/what-i

Those are called "railroad diagrams". I don't have a specific recommendation, but this should get you started: http://stackoverflow.com/questions/773371/what-is-a-good-tool-for-creating-railroad-diagrams/ http://stackoverflow.com/questions/773371/what-is-a-good-too...