Twine is an open-source tool for telling interactive, nonlinear stories. (At least, that’s what the website says.)
I thought I might use it with my after-school group this quarter, as we’re working on creative writing. I could see it as a way kids can easily write and share a choose-your-own adventure type story. If we get that done, I’ll try to share their results (or at least my reflections).
I made one but it’s mostly a vehicle for bad jokes.