What are some alternatives?
Confluence - Confluence is content collaboration software that changes how modern teams work
Readymag - Readymag is a comprehensive solution that allows you to design web publication, magazines, presentations, websites, and all the other publications.
GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.
Zmags - Zmags provides solutions create and publish web experiences instantly.
Nuclino - Nuclino is a unified real-time workspace for teams that brings all your notes, tasks, and docs together in one place.
SPIP - Système de Publication pour Internet