NARROWS is an online storytelling system. The name stands for NARRation On Web System. The easiest way to explain it is to imagine an online Choose Your Own Adventure book with the following key differences:
Instead of having a single reader, there are as many readers as protagonists in the story (it could be one, but also four or five).
Instead of having to pick between two or three preset choices after each “chapter”, readers can write in a textbox whatever their characters do.
Instead of the narrator writing the whole story with all possible branches upfront, then give it to the readers; the narrator writes only one chapter at a time and waits for the readers to submit the “actions” for their characters. Based on those actions, the narrator writes the next chapter.
You can also think of it as a way of running ruleless, diceless RPGs online (which is indeed the reason why I wrote it in the first place).