Jason Stallings

Github Shortcode is a plugin that allows you to embed a GitHub repository in a page or post using a simple shortcode.
Usage:
[github repo=”octalmage/Github-Shortcode”]

Github Shortcode

Easily display GitHub Repositories in Pages/Posts.

ThomasHambach

Inspired by the script written by Blair Vanderhoof, this plugin allows you to input gist files directly into your WordPress posts using a jQuery callback.
Currently supports: * Showing a whole gist. * Showing single file in a gist. * Showing certain lines of a single file in a gist.

Gist Embed

This plugin allows you to input gist files directly into your Wordpress posts with a click of a button.

Github Shortcode vs Gist Embed