A second feature I find much more useful: Multi-tabs, where you can have multiple documents at once in a tabbed interface, similar to a tabbed web browser. Some may prefer to read from paper copies — I tend to print just the most important articles.
Lastly, the flow in workflow is important. They focus on getting and keeping you writing, rather than the entire process from start to finish.
I introduce you to Self Control. It helps you keep track of your plot and characters. Like LightPaper, Write provides a scratch pad in the Mac menu bar. Here is a warning I received when trying to open the tutorial project on my iMac when I already had it open on my MacBook.
But as a tool for writing Academic papers, how does it stand up? Whilst reading I highlight relevant paragraphs or sentences — as less is better try to avoid highlighting entire pages — and add comments with any thoughts or ideas.
With Grabb, you can only create screenshots and save them while with Skitch, you can create screenshots and modify them.
Manuskript Mac, Linux and Windows is a free and open-source writing tool for writers with features similar to Scrivener. If Ulysses is a Porsche, Scrivener is a Volvo.