f13dev

If you are a programmer who uses GitHub then why not share your coding projects via your WordPress blog by adding a snapshot 
of your profile as a widget
Simply add the widget to your preferred location and enter your GitHub username.
Features include:
<ul>
<li>Cached using Transient</li>
<li>Displays your GitHub profile image</li>
<li>Shows your GitHub bio, if set</li>
<li>Shows your Location, email address & blog URL if set</li>
<li>Provides links to your followers, following and starred repositories</li>
</ul>

GitHub Mini Profile Widget

Easy to use and a nice design, thanks! 
I didn't need the API key when using a cache timeout of 30 minutes, which is great.

Clean and easy to use

Add a snapshot of your GitHub profile to your website with with this widget.

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

GitHub Mini Profile Widget vs Gist GitHub Shortcode