Docs: Word, Scrivener, Google
I use MS Word, Scrivener and Google Forms for all kinds of different things.
Scrivener is for the creating process.
MS Word is more for revising.
Google Forms are an easy way to sign up beta readers, and bloggers willing to post cover reveals, blog tour stops, etc.
Note: So far I've only used Google Forms behind the scenes and have only included the link to the site.