Scrivener

Scrivener has become an integral tool when it comes to my writing and development processes. It's entirely worth the $45, and even comes with a 30 day free trial (which is perfect for NaNoWriMo).

It's also available for Windows, Mac, and Linux (beta)

From their site:

Writing a novel, research paper, script or any long-form text involves more than hammering away at the keys until you’re done. Collecting research, ordering fragmented ideas, shuffling index cards in search of that elusive structure—most writing software is fired up only after much of the hard work is done. Enter Scrivener: a word processor and project management tool that stays with you from that first, unformed idea all the way through to the final draft. Outline and structure your ideas, take notes, view research alongside your writing and compose the constituent pieces of your text in isolation or in context. Scrivener won't tell you how to write—it just makes all the tools you have scattered around your desk available in one application.
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