What are some alternatives?
GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.
Confluence - Confluence is content collaboration software that changes how modern teams work
ReadTheDocs - Spend your time on writing high quality documentation, not on the tools to make your documentation work.
Jama Connect - Collaborate with your team and share the data you care about in one place
Doxter - Software for creating, organizing and publishing project documentation
DokuWiki - dokuwiki [DokuWiki]