Some RPGs get called "story games," but that is not what I am looking for at the moment. Instead, I am searching for story-writing systems that lay out a framework for multiple people crafting a cohesive narrative together.

A key feature here is the ability to go back and forth across the narrative's timeline, perhaps even jumping right to the ending, to adjust details and create scenes as needed. The only system I know of that does this is Microscope and its variant modes in Microscope: Explorer; the system lays out rules for who gets to add details at any given moment, and encourages jumping back and forth across the timeline to flesh out the ongoing narrative. Nobody controls a single PC in Microscope, reducing the odds of any one player growing overly attached to a single character.

What other systems are similar?