I was about to play Dogs in the Vineyard the day before yesterday. Since everyone in Sweden is ill, all the time, it didn't happen. But, when I was sitting on the bus going to where I though we were having a game, I realized one thing about Dogs. In DitV you as the GM generate a town, according to specific rules. Some NPCs will inhabit that town, and they are all involved in "the thing" that's happening in that town. They all have an agenda and want something specific from the characters, and you have to specify what will happen if the characters never had entered that town. Then you let the players loose and don't ever try to play god! It struck me that this is the ultimate toolbox for sandbox play.
So, that means that the most well known new school Forge-style indie game is based on sandbox play, not Story. Interesting.