cmark is the C reference implementation of CommonMark, a rationalized version
of Markdown syntax with a spec.

It provides a shared library (libcmark) with functions for parsing CommonMark
documents to an abstract syntax tree (AST), manipulating the AST, and rendering
the document to HTML, groff man, LaTeX, CommonMark, or an XML representation of
the AST. It also provides a command-line program (cmark) for parsing and
rendering CommonMark documents.

Homepage:
https://github.com/commonmark/cmark
