Novel writing and idea organizing application.
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Pro Easy overview of characters rolls
You can quickly and easily see how many lines each character has, as well as what scenes they are in. This makes equalizing the rolls of each much easier, which will help you balance your scenes so your story isn't too heavy on one plot line (or at least it will help you notice if one plotline is much longer than another).
Con Native client on Windows
While the website provides instructions to run the application on OSX and Linux, it is designed for Windows XP and up.