MkDocs - Project documentation with Markdown.
Community Questions for Confluence - Keep questions and answers in one place with an engaging, community-driven Q&A discussion forum, powered by Confluence
GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.
Question2Answer - A Q&A site helps an online community to share knowledge.
Docusaurus - Easy to maintain open source documentation websites
Stack Overflow for Teams - Everything you love about Stack Overflow in a private space.