I don't think that exists. but I want it to.
Well, according to my friend, he said it does. He says the graphics aren't great, but you get items that you can use to build various settings. You then invite a group of people together and you role-play in the settings, using some of the game's internal actions and then typing out more explicit details of what you are doing. He said he did one where they were doing vampires versus slayers, another in a medieval fantasy world like Skyrim, and one set in the Star Wars universe even. It sounded amazing and he wouldn't make stuff up. It wasn't designed as an RPG, but he said it was sandbox and you could thus do that.