James Robinson

A simple plugin that enables a shortcode for embedding Gist code in WordPress.
The shortcode has two attributes, the Gist source URL and, optionally, the height of the embedded code window.
<pre><code>[gist src="" height=""]
</code></pre>
The Gist <code>src</code> attribute must be the embed URL, for example: https://gist.github.com/imaginarymedia/316a29936e5e7d709665.js
The Gist <code>height</code> attribute is optional and can be any value with a valid CSS unit measure: em, %, px, vh, etc. It will apply a max-height to the gist.
The plugin also creates UI buttons for both the visual and text editors.
If you have suggestions for improvements, please contact us. via the <a href="https://wordpress.org/support/plugin/wp-gist-embed" rel="ugc">plugin support page</a> and if you find this useful, please <a href="https://wordpress.org/support/view/plugin-reviews/wp-gist-embed" rel="ugc">review the plugin</a>.
Developed by <a href="https://jmr.codes" rel="nofollow ugc">James Robinson</a>.
** TO DO ** 
* Validate the gist src URL

WP Gist Embed

This plugin provides Gist embedding via shortcode as well as adding Gist embed buttons to the visual and text editors.

Claudio Sanches

This plugin adds Github Gists in your posts via shortcode.
Examples
Add a full gist:
<pre><code>[gist id="3837669"]
</code></pre>
Add a specific file in a gist:
<pre><code>[gist id="3837669" file="index.php"]
</code></pre>
<h3>License</h3>
Gist GitHub Shortcode is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published 
by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
Gist GitHub Shortcode is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of 
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with Gist GitHub Shortcode. If not, see <a href="http://www.gnu.org/licenses/" rel="nofollow ugc">http://www.gnu.org/licenses/</a>.

Gist GitHub Shortcode

Adds Github Gists in your posts via shortcode

WP Gist Embed vs Gist GitHub Shortcode