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Pandoc is a Haskell library for converting from one markup format to another, and a command-line tool that uses this library. It can read markdown and (subsets of) reStructuredText, HTML, and LaTeX, and it can write markdown, reStructuredText, HTML, LaTeX, ConTeXt, Docbook XML, OpenDocument XML, GNU Texinfo, RTF, ODT, MediaWiki markup, groff man pages, and [[Presentation|S5 HTML slide shows]].

[http://wkhtmltopdf.org/index.html wkhtmltopdf] is an LGPLv3 tool to render HTML into PDF and various image formats using the QT Webkit rendering engine.