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.
Doxygen - Doxygen is a tool for generating documentation from annotated C++ sources, as well as other popular...
Nuclino - Nuclino is a unified real-time workspace for teams that brings all your notes, tasks, and docs together in one place.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.