GitHub - Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.

Surf - A simple web browser based on WebKit2/GTK+

GitNews Web - Trending repositories from GitHub, HackerNews & Reddit

GitHub Repository Size - Browser extension to show file and repo size in GitHub

AnalyzeMyRepo.com - Free analysis & insights for any GitHub repository

Refined GitHub - Browser extension that makes GitHub cleaner & more powerful