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Become a sponsor to John MacFarlane

John MacFarlane

Berkeley, CA

I have been developing open-source software since 2006. I am the creator and lead developer of the document conversion software pandoc. I am also the author of the commonmark spec, and I wrote the reference implementation cmark, which is the basis for the library that powers markdown conversion on GitHub.

Other libraries I maintain include

  • unicode-collation (pure Haskell implementation of the Unicode Collation Algorithm)
  • zip-archive (Haskell library for creating and reading zip archives)
  • skylighting (Haskell library for syntax highlighting)
  • texmath (Haskell library for converting between math formats: TeX, OOXML, MathML, eqn)
  • ipynb (Haskell library for manipulating Jupyter notebooks)
  • doctemplates (Haskell templating library for plain-text documents)
  • doclayout (Haskell prettyprinting library for plain-text documents)
  • yst (static site generator using pandoc and data from YAML files)
  • citeproc (Haskell library for processing citations using CSL stylesheets)
  • commonmark.js (JavaScript commonmark-parsing library)
  • commonmark-hs (Haskell library for parsing commonmark with many extensions)
  • djot (rational, consistent light markup format with fast parser in Lua)

Sponsoring me will help encourage me to continue spending much more time than I should be on these projects and others!

42 sponsors are funding jgm’s work.


Featured work

  1. jgm/pandoc

    Universal markup converter

    Haskell 26,221
  2. jgm/texmath

    A Haskell library for converting LaTeX math to MathML.

    Haskell 201
  3. jgm/skylighting

    A Haskell syntax highlighting library with tokenizers derived from KDE syntax highlighting descriptions

    Haskell 145
  4. jgm/commonmark-hs

    Pure Haskell commonmark parsing library, designed to be flexible and extensible

    Haskell 110
  5. commonmark/commonmark-spec

    CommonMark spec, with reference implementations in C and JavaScript

    Python 4,605
  6. commonmark/cmark

    CommonMark parsing and rendering library and program in C

Select a tier

$4 a month


Coffee tier! Get a sponsor badge and show your support for my contributions to open-source software.

$16 a month


You rely on pandoc or my other software to do your work. (How much time would it have taken to convert those 500 unix man pages to markdown without pandoc?)

$64 a month


Your small business depends on pandoc or my other software and you're invested in its continued development and maintenance.

$256 a month


Your enterprise depends on pandoc or my other software and you're invested in its continued development and maintenance.