“Tears of Steel” is an Open Source short film created by the Blender Institute. It has some of the best Green Screen practice footage available right now. The shots are hosted by xiph on their file server. Unfortunately, there is no easy way to see what the shots look like without downloading a few EXRs of the image sequence.
I searched for a good while to find some sort of browser and I couldn’t find anything. So because of this, I decided to create an image based browser for these Tears of Steel shots. I hope it helps!