BookStack is a powerful and easy-to-use platform for creating, hosting and sharing digital books. It features a wide range of features, including an intuitive user interface, drag-and-drop book building, a built-in search engine, and powerful analytics. The app enables publishers and authors to create beautiful, interactive books for both online and offline consumption. It provides tools for adding text, images, video, audio, and animations to create engaging content. It also allows for collaboration with other authors, editors, and designers, so that everyone involved in the book creation process can work together. Finally, BookStack allows for sharing books across multiple platforms, including mobile and desktop. With its support for e-commerce, publishers and authors can easily monetize their books.
Discontinued MarkWiki is not maintained as of January 2017 according to the GitHub repository.
Google Docs
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DokuWiki is quite powerful once you get used to using the syntax. Once you use it, you can work very fast in DokuWiki.