Markdown by DaringFireball - Text-to-HTML conversion tool/syntax for web writers, by John Gruber
GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.
Asciidoctor - In the spirit of free software, everyone is encouraged to help improve this project.
MkDocs - Project documentation with Markdown.
pandoc - Pandoc is a Haskell library for converting from one markup format to another, and a command-line...
Docusaurus - Easy to maintain open source documentation websites