Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
Write App - No-distraction writing tool for your productivity.
Final Draft - Use your creative energy to focus on the content; let Final Draft take care of the style.
Hemingway - Hemingway App makes your writing bold and clear.
yWriter - Free writing software designed by the author of the Hal Spacejock and Hal Junior series. yWriter6 helps you write a book by organising chapters, scenes, characters and locations in an easy-to-use interface.
ProWritingAid - For the smarter writer. A grammar checker, style editor, and writing mentor in one package.