Google Doc Publisher - Make Google Docs good-looking in two clicks
Knotable - Cut the noise out of busy email threads
Publish to WordPress - Publish content on WordPress right from Google Docs
Scrapbox - A new style of note-taking that lets you create, discuss, and learn together in one self-organizing space.
Content Editor 2.0 by Surfer - Content Editor is the most advanced content optimization tool that allows you to write and grade your work.
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.