Markdown

• remarkjs/remark: Markdown processor powered by plugins based on @unifiedjs (and @vfile, @syntax-tree)

• Turndown Demo - HTML to CommonMark and Markdown

• CommonMark

• Daring Fireball: Markdown

About GFM code languages IDs:

• ID could be the name (replace spaces by -, eg. Game Maker Language gives game-maker-language), aliases or extensions, with or without leading dot

• GitHub Flavored Markdown (GFM) language IDs · jmm/gfm-lang-ids Wiki

• linguist/languages.yml at master · github/linguist

• github/markup: Determines which markup library to use to render a content file (e.g. README) on GitHub

• Markdown Here

• borismus/markdown-preview: Enables Chrome to render markdown files as HTML

• adam-p/markdown-here: Google Chrome, Firefox, and Thunderbird extension that lets you write email in Markdown and render it before sending.

• aaronsw/html2text: Convert HTML to Markdown-formatted text.

• jgm/pandoc: Universal markup converter - Pandoc - About pandoc

• michelf/php-markdown: Parser for Markdown and Markdown Extra derived from the original Markdown.pl by John Gruber.

• textile/php-textile: Textile markup language parser for PHP

• netgusto/upndown: HTML to Markdown javascript converter

• vmg/redcarpet: The safe Markdown parser, reloaded.

• Elements or Lower :: Geekery : XML : XHTML-to-Markdown.html - XHTML-to-Markdown XSLT