Not really a photography tool but it might have its uses, but it’s an awesome 3D modeling and animation program and it doubles as a video editor. In fact the best free video editing software I’ve seen, looks almost as good as the Sony Vegas I used to have which was pro video software and like $600 or some shit. Free… blender.org
I’ve been learning this more, looks like a really nice video editing program just a bit of learning involved and not as user friendly as say Sony Vegas but almost on the same level probably once you learn how to use it. This guy has some nice mostly short tutorials.