jamqes

Lightweight widget shortcodes to display GitHub buttons and gists on your blog. Includes shortcode for embedding GitHub hosted gists and buttons for:
<ul>
<li>Follow</li>
<li>Watch</li>
<li>Star</li>
<li>Fork</li>
<li>Download</li>
<li>Issue</li>
</ul>
The plugin implements <a href="https://github.com/ntkme/github-buttons" rel="nofollow ugc">ntkme’s ‘github-buttons’</a> and GitHub’s gist display as shortcodes.
<h3>Usage</h3>
GitHub Follow Button: 
Add the <code>[Github_User_Button user='JBarnden' size='large' show_count='true']</code> shortcode in your content and replace <code>JBarnden</code> with the desired GitHub username.
GitHub Repo Buttons: 
Add the <code>[Github_Repo_Button user='JBarnden' repo='wp-github-widgets' size='large' show_count='true']</code> shortcode in your content, replacing <code>JBarnden</code> with the desired GitHub username and <code>MyRepo</code> with the desired repo belonging to the specified user. 
You can set the<code>type</code> attribtute to <code>watch</code>, <code>star</code>, <code>fork</code>, <code>issue</code> or <code>download</code>.
Display Gist: 
Add the <code>[Gist]gist_id[/Gist]</code> where <code>gist_id</code> is replaced with the id of the desired Gist.
More detailed documentation can be found <a href="https://github.com/JBarnden/wp-github-widgets#usage" rel="nofollow ugc">here</a>. If you find the plugin useful or have any feedback I’d really appreciate your review.
<h3>Feature Requests and Contributions</h3>
Please submit feature requests and contributions via the issues section of <a href="https://github.com/JBarnden/wp-github-widgets/" rel="nofollow ugc">the plugin’s GitHub Repository</a>. 
If you feel like improving the plugin, pull requests are both welcome and appreciated.

Widget Shortcodes for Github

Lightweight widget shortcodes to display GitHub buttons and gists on your blog.

pinchoalex

Unlike the standard embedding method that use script like this
<pre><code><script src="https://gist.github.com/..."></script>
</code></pre>
to embed gist code, Gist API Code insert plugin inserts code directly in to your posts using simple shortcode and highlights it with prism code highlighter.
Examples
Add all files from a gist:
<pre><code>[apCI id="123456789"]
</code></pre>
Add single file from a gist:
<pre><code>[apCI id="123456789" file="filename.php"]
</code></pre>
Add single file from a gist with raw file link:
<pre><code>[apCI id="123456789" file="filename.php" raw="yes" ]
</code></pre>

Gist API Code insert

Inserts Github Gist code directly in to your posts via shortcode without using js embed script

Widget Shortcodes for Github vs Gist API Code insert