Here is a list of AI-powered tools and platforms that can help in writing eBooks:

1. **OpenAI GPT-4**: The GPT-4 model can generate content based on prompts, providing coherent and creative text that can be used in eBooks.
2. **Jasper (formerly Jarvis)**: Jasper is an AI writing assistant that can help generate ideas, write content, and edit text for eBooks.
3. **Copy.ai**: This AI tool helps in generating creative content, including eBook sections, titles, and summaries.
4. **Rytr**: Rytr is an AI-powered writing assistant that can help generate content for eBooks quickly and efficiently.
5. **Writesonic**: An AI writing tool that assists in creating content for various purposes, including eBooks, blog posts, and marketing materials.
6. **Sudowrite**: Specifically designed for creative writing, Sudowrite helps authors generate ideas, write prose, and overcome writer’s block.
7. **AI Dungeon**: While primarily a text-based adventure game, AI Dungeon uses the GPT model to generate creative stories and can be a useful tool for brainstorming and writing eBooks.
8. **TextCortex**: This AI tool aids in generating and refining content for eBooks, articles, and other forms of writing.
9. **Article Forge**: Uses AI to generate high-quality, unique articles and can be adapted for writing sections of eBooks.
10. **ContentBot**: An AI writing assistant that helps generate ideas, outlines, and content for eBooks and other writing projects.
11. **INK Editor**: An AI-powered writing tool that helps with SEO optimization, content generation, and editing for eBooks.
12. **Kuki AI**: Kuki uses natural language processing to generate engaging and interactive content, which can be utilized in writing eBooks.
13. **QuillBot**: An AI paraphrasing and summarizing tool that can assist in refining and generating content for eBooks.
14. **Narrative Device**: An AI writing tool that helps authors generate story ideas, characters, and plot points for fiction eBooks.
15. **Cleverbot**: While primarily a chatbot, Cleverbot can generate conversational text that may inspire dialogue or character interactions in eBooks.
16. **ShortlyAI**: An AI writing assistant that helps in generating long-form content, including eBooks and novels.
17. **Wordtune**: An AI writing assistant that helps improve, rewrite, and enhance content for eBooks.
18. **HyperWrite**: A writing assistant that uses AI to generate and refine content for various purposes, including eBooks.
19. **AI Writer**: An AI-powered content creation tool that helps generate text for eBooks and other written materials.
20. **Brain.fm**: While primarily a focus-enhancing tool, Brain.fm can help writers concentrate better, indirectly aiding in the writing process of eBooks.
21. **ContentStudio**: A content creation and curation tool that uses AI to help generate ideas and write content for eBooks.
22. **WriteSonic**: An AI writing assistant that helps create high-quality content for various purposes, including eBooks.
23. **Kafkai**: An AI content generator that specializes in niche content and can be used to write eBooks.