Akeda Bagus

This plugin doesn’t contain any feature (widget or shortcode) that you can use directly once the plugin is activated. This 
plugin contains API to help you in making a call to GitHub API resources. There’s <code>includes/tools.php</code> file that show 
you how to use the API from this plugin to make a call to various GitHub resources (for instance to get repository information).
Development of this plugin is done on <a href="https://github.com/gedex/wp-github-api" rel="nofollow ugc">GitHub</a>. Pull requests are always welcome.
If you’re looking for widget or shortcode you can try following plugins (which depend on GitHub API plugin):
<ul>
<li><a href="https://wordpress.org/plugins/gh-profile-widget" rel="ugc">GitHub Profile Widget</a></li>
<li><a href="https://wordpress.org/plugins/gh-members-showoff" rel="ugc">GitHub Members Show-off</a></li>
</ul>

GitHub API

This plugin contains easy-to-use API that uses WP HTTP API to make a request to GitHub API v3 resources.

JordiPlana

This plugin hooks the normal WordPress workflow in order to determine if the request is processing will cause a 404 HTTP error. In that case it prevents WordPress to do any other processing and sends the user to the page defined in the plugin options.
A working and simple solution.
For more information about this plugin you can check <a href="http://jordiplana.com/404-simple-redirect-plugin-for-wordpress" title="404 Simple Redirect Plugin for WordPress" rel="nofollow ugc">the official page</a>.

404 Simple Redirect

This plugin hooks the normal Wordpress workflow in order to determine if the request is processing will cause a 404 HTTP error.

GitHub API vs 404 Simple Redirect