My game is Fateweavers. It uses tarot and involves doing readings for characters to determine what happens in a semi-structured way. Its very narrative focused with no real crunch and diplomatic resolution mechanics. The players arent direct actors in the scene instead they are playing the role of the fates, influencing the mortals to do their will as in many myths. Also as in the myths, those mortals are more than capable of throwing a spanner in the works!
It could easily be used for silly or serious games and was designed around one shots but could potentially be used for ongoing games. I do have a few tips for doing that in the PDF.