LibreOffice - Free office suite, open source, and compatible with .doc, .docx, .xls, .xlsx, .ppt, .pptx files. Updated regularly – download for free. Originally based on OpenOffice.org.
MkDocs - Project documentation with Markdown.
ONLYOFFICE - ONLYOFFICE is a complete office and productivity suite.
GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.
WPS Office - Would you need Office Word, Excel or PowerPoint for Home, business or School? WPS.com would give you right version for you.
Docusaurus - Easy to maintain open source documentation websites