Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
massCode - A free and open source code snippets manager for developers.
GitZip - Download or create a download link for a GitHub project folder/sub-folder or file.
Bootsnipp - Hundreds of hand picked snippets for Bootstrap
Board for Github - A webview based GitHub project app with native features
CodeMyUI - Handpicked code snippets you can use in your web projects