Plottr - The #1 rated visual book planning and series bible software for professional and aspiring writers.
Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
Offline Notepad - Offline Notepad app allows users to create their weekly shopping list, so they don’t forget anything important.
Final Draft - Use your creative energy to focus on the content; let Final Draft take care of the style.
Epsilon Notes - Common Mark editor for Android and Windows
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.