Question: I'm looking for a way to write a book in my native language, which is not English - are there any tools that support multiple languages?

For writing a book in your native language, NovelistAI is a great option. It supports more than 30 languages and lets you build custom novels, non-fiction and interactive books in a variety of styles and genres. The service includes AI-generated content, support for multiple languages, different document formats, images and audiobooks, and a personalized reading experience. The service is on a credit-based pricing system, with a free tier and premium tiers costing $12 and $48 per month, respectively.

Another option is Inkflow, which is geared for non-fiction books. It can automatically generate content, let you customize outlines and support multiple languages. The service, built on AWS for fast content generation and secure storage, is designed for individuals, media production teams and marketing agencies. Pricing starts at $99 per year, and you can use it to write books with more than 20,000 words.

For a broader writing tool, Auri is a productivity suite with a multilingual AI Keyboard that spans more than 80 languages. It also includes translation, paraphrasing, grammar checking and a voice dictation system. Auri is available on iPhone, iPad, Mac and Apple Watch, and offers a free version with daily limits and a Pro subscription starting at $9.99 per month for unlimited use.