Scrivener is described as 'Ideal for long writing projects with flexibility in structure, Scrivener integrates easy project outlines and allows seamless restructuring with drag and drop' and is a very popular Novel Authoring tool in the news & books category. There are more than 100 alternatives to Scrivener for a variety of platforms, including Windows, Mac, Web-based, Linux and Android apps. The best Scrivener alternative is Manuskript, which is both free and Open Source. Other great apps like Scrivener are yWriter, Zettlr, bibisco and Quoll Writer.
This is a word processor, not a novel authoring software.