NovaScriber - A most awesome tool to write novels
Linked Ideas - A macOS/iOS apps to treat ideas as links of concepts.
Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
Xmind - Xmind is a brainstorming and mind mapping application.
SceneOne.app - Book writing software that runs in any browser. It is designed by novelists to have the tools and workflows they need yet be simple to use, and runs on every device (Windows, Mac, iPad, phones, etc).
vym - VYM (View Your Mind) is a tool to generate and manipulate maps which show your thoughts.