Collaboration tool for teams crafting magazines

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Not sure why, but in their 3 features below the hero, I read "FatPan" instead of "FlatPlan" as the first item. FlatPlan doesn't roll of the tongue. Not sure what it is either. Minor pet peeve -- at the bottom of the site there's an email field that doesn't really look like a field. At first, when scrolling down quickly, I thought it was two buttons (one says email, one says sign up). I miss the days when a form field was a form field.
I'm very interested in collaborative content creation platforms. Just signed up. Could be useful for @StartupEdition.