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.
Sphinx Search - Sphinx is an open source full text search server, designed with performance, relevance (search quality), and integration simplicity in mind. Sphinx lets you either batch index and search data stored in files, an SQL database, NoSQL storage.
Nuclino - Nuclino is a unified real-time workspace for teams that brings all your notes, tasks, and docs together in one place.
Doxygen - Doxygen is a tool for generating documentation from annotated C++ sources, as well as other popular...