Blender is used for animating things such as you see in major cartoons, and it is really cool:
That was my second try, my first was horrible. But anyway, you can make big movies, or just nice pictures of a cartoon room or something. In that picture above, I used blocks with the grid below, then I used a mirror so that way I couldn't make mistakes if the sides weren't even. I am not yet done, because I have to color it and put eyes, etc. I will have another blog post explaining what it can do.