cmarkgfm

cmarkgfm is an open-source C library that implements GitHub Flavored Markdown (GFM) extensions on top of the CommonMark reference parser, cmark. It provides parsing of Markdown input into a structured representation and rendering to HTML, with GFM-specific features available through the API.

The project originated as an extension of cmark to add GitHub-specific features and is maintained by an active open-source community. It targets developers who need a lightweight, embeddable Markdown renderer that matches GitHub’s flavor in environments outside GitHub.

Key features include support for GFM extensions such as tables, fenced code blocks, strikethrough, autolinks, and task lists. The library can enable or disable individual extensions and provides a C API for integrating parsing and rendering into other software.

Implementation-wise, cmarkgfm includes a parser, an abstract syntax tree, and rendering backends, with options to customize rendering and to output HTML or other formats. It is designed to be portable across platforms and suitable for embedding in various applications.

Availability and licensing: The project is open-source and hosted on a code hosting platform. It uses a permissive license, allowing use in both open-source and proprietary software.

See also: CommonMark, cmark, GitHub Flavored Markdown.