Maruku is a Markdown interpreter in Ruby. It features native export to HTML and PDF (via Latex). The output is really beautiful!

== DESCRIPTION: Filters from your choice of Markdown, Textile or Plain HTML into HTML and gives appropriate markup for syntax highlighting on code. == FEATURES/PROBLEMS: * Formats Textile or Markdown * Applies markup to code for syntax highlighting. * requires a filter(string) column

Provides simple extensions to Markdown that are useful for academic writing

A text parsing engine. The syntax is defined outside the engine as regex-based rules, in YAML or Ruby. It supports layering and multiple output types. Rules for Markdown to HTML are included, with optional layered extensions for tables and wikilinks.

a fast library for formatting Textile and Markdown as HTML