Blurb - Create and self-publish books, magazines & ebooks
MkDocs - Project documentation with Markdown.
CreateSpace - Publish your words, your way
GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.
IngramSpark - IngramSpark is an Online publishing services provider platform that allows you to publish or print books that are in high quality, and its global distribution service enables you to post and share around the globe.
Docusaurus - Easy to maintain open source documentation websites