DocGen - Static website generator
GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.
openSourceCM - Web-based legal document processing and contract management
MkDocs - Project documentation with Markdown.
LogicalDOC - A document management system such as LogicalDOC can help your organization better manage business processes and put order in the chaos of documents every day run your business.
Docusaurus - Easy to maintain open source documentation websites