GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.
Doxygen - Generate documentation from source code
Developerhub.io - All-in-One Platform for Online Documentation
Slate API Docs Generator - Create beautiful, intelligent, responsive API documentation.
SassDoc - SassDoc is to Sass what JSDoc is to JavaScript: a documentation system to build pretty and powerful docs in the blink of an eye.
Sandcastle - Sandcastle produces accurate, MSDN style, comprehensive documentation by reflecting over the source...