The best novel writing AI tools in the industry are considered to be Sudowrite, Jasper, Rytr, NovelAI, QuillBot, and AI Dungeon. These tools help authors streamline their writing process by providing features such as outlining story beats, describing characters and settings, editing, and paraphrasing and rewriting. Sudowrite is considered the best overall AI writing program for fiction authors, while Jasper is the best for trainable narrative styles. Rytr is the best budget option, NovelAI has the best interface, QuillBot is best for paraphrasing and rewriting, and AI Dungeon is best for immersive storytelling. These tools help authors to write more efficiently and effectively, allowing them to focus on their creative vision rather than getting bogged down in the technical aspects of writing.