Ruby
Markdown libraries for Ruby — a pure-Ruby option plus fast bindings to C parsers. Back to the overview.
kramdown
A pure-Ruby parser with an extended syntax and multiple output formats.
pure Ruby
require 'kramdown'
html = Kramdown::Document.new('# Hello *world*').to_htmlRedcarpet
A fast, safe library binding the C Sundown parser; long used by GitHub.
fastC-backed
require 'redcarpet'
markdown = Redcarpet::Markdown.new(Redcarpet::Render::HTML)
html = markdown.render('# Hello *world*')CommonMarker
Ruby bindings to GitHub's cmark-gfm — CommonMark and GitHub Flavored Markdown.
CommonMarkGFM
require 'commonmarker'
html = Commonmarker.to_html('# Hello *world*')