Evan Solomon

Comment forms allow some HTML, this plugin extends that to let users type in <a href="http://daringfireball.net/projects/markdown/" rel="nofollow ugc">Markdown</a> and have it automatically converted to HTML. It also extends Markdown with a couple features made popular <a href="https://github.com/github/github-flavored-markdown" rel="nofollow ugc">by GitHub</a>. Conversion from Markdown to HTML is completely automated and doesn’t require anything on the commenter’s part.
The feature additions from GitHub are:
<ul>
<li>Single linebreaks are treated as new paragraphs</li>
<li>Code “fencing” with three backticks (“`)</li>
</ul>
Two notable features from GitHub’s Markdown implementation are missing:
<ul>
<li>To do lists: Doing these well would require some front end interaction, which I decided is outside the scope of this plugin at least for now</li>
<li>Repository autolinking (e.g. comments, issues, etc): These seemed a little too GitHub-specific.</li>
</ul>
GitHub-Flavored Markdown Comments is developed, unsurprisingly, <a href="https://github.com/evansolomon/wp-github-flavored-markdown-comments" rel="nofollow ugc">on GitHub</a>.

GitHub-Flavored Markdown Comments

WordPress plugin to let commenters use (GitHub-flavored) Markdown, and turn it into HTML.

Whodunit

Jb Audras

Pedro Mendonça

vsc55

This plugin adds a GitHub Repository Embed Block to the Block Editor.
It is developed on <a href="https://github.com/audrasjb/embed-block-for-github" rel="nofollow ugc">GitHub</a>. Contributions welcome!
Special thanks: 
– <a href="https://github.com/pedro-mendonca" rel="nofollow ugc">@pedro-mendonca</a> for i18n/l10n fixes and portuguese translation. 
– <a href="https://github.com/vsc55" rel="nofollow ugc">@vsc55</a> for Dark Mode Enhancement, full code refresh and spanish translation.

Embed Block for GitHub

Easily embed GitHub repositories in Gutenberg Editor.

GitHub-Flavored Markdown Comments vs Embed Block for GitHub