The following Haskell libraries have been developed to support pandoc:

skylighting-core and skylighting

Syntax highlighting engine supporting over 140 languages.

citeproc

Citation processing using CSL stylesheets.

texmath

Conversion of math between tex, Word equation, MathML, and GNU eqn.

unicode-collation

Proper Unicode collation (sorting).

doclayout

Combinators for laying out a textual document, with support for line wrapping, tabular layout, and more.

doctemplates

Supports pandoc’s templates.

commonmark, commonmark-extensions, and commonmark-pandoc

Efficient, standards-compliant parser for commonmark and extensions.

ipynb

Representation of Jupyter notebooks and conversion to and from JSON.

zip-archive

A pure zip file creator and extractor, used by pandoc for docx, ODT, and EPUB.

rfc5051

Simple unicode collation (used for citation sorting).

emojis

Conversion between emoji characters and aliases.

jira-wiki-markup

Support for parsing Jira wiki syntax.