What is the Awesome GitHub list? It's a collection of things that make GitHub one of the most amazing co-creation platforms in the world.
It is specifically focused on GitHub, and not on Git. Git is indeed awesome. And there would be no GitHub without Git. And yet, GitHub has become much more than a home to much of humanity's open-source code; it has become one of the world's most vivid examples of the power of mass collaboration.
All that to say, this list -- Awesome GitHub -- is an attempt to document that aspect of what is awesome: everything that GitHub has become -- far beyond what Git is today, and beyond where GitHub started just eight years ago.
STL files - It's pretty amazing, 3D right in the browser.
CSV - Data journalists and civic data nerds rejoice, comma separated values right in the browser!
SVG - Not only can you view scalable vector graphics in the browser, but you can see the difference between versions visually! You've got to see it to believe it. (In fact, you can do this with most image files.)
PSD - That's right, same idea as SVG, but for Photoshop files!