Excellent editor and project manager for writers
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Scrivener is a project management and writing tool that aims to make you a better writer. It helps you outline and structure your ideas, take notes, build storyboards, and much more. There's a handy theme tracker which allows you to track themes using keywords and it can also help you combine multiple scenes into a single text.
The developers claim that Scrivener is so good that it's been enthusiastically adopted by best-selling novelists. You can believe it too because it's clear to see how Scrivener can help you write a book far more logically and painlessly than trying to write on a blank canvas in Word, for example. The corkboard view, in particular, is excellent at allowing you to pinpoint and categorize different scenes for chapters, scenarios, and concepts.
Although Scrivener takes a bit of getting used to, serious writers may find that it helps significantly improve the creative writing process.