Reedsy - Reedsy is a complete book publishing platform with an elegant, collaborative online editor.
Blurt - Compose efficiently. Edit smartly. Stay on track. Blurt is all you need to write — in one sleek tool.
GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.
Ulysses.app - A powerful writing tool for Mac, iPad, and iPhone
Squibler - Write & publish your book in 30 days
Haven - Personal space security app, backed by Snowden