Markdown by DaringFireball - Text-to-HTML conversion tool/syntax for web writers, by John Gruber
Doxygen - Generate documentation from source code
GitHub Flavored Markdown - GitHub uses "GitHub Flavored Markdown," or GFM, across the site--in issues, comments, and...
DocFX - A documentation generation tool for API reference and Markdown files!
StackEdit - Full-featured, open-source Markdown editor based on PageDown, the Markdown library used by Stack Overflow and the other Stack Exchange sites.
Daux.io - Daux.io is a documentation generator that uses a simple folder structure and Markdown files to...