This is something that came to my mind recently although I'm probably not the first one.
My idea is: Different writers work together on one project which may be a certain story or even a whole "universe" which is then populated with different stories based on the same ideas or characters and locations. Notes and ideas that certain writers might have are written down to the wiki and all other authors can see them and discuss them. This is the part where the source is open. Complex stories should be easier to maintain with a main author having an eye on the universe.
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