Signing Avatar - Sign Language and ELL Enhancer - 'Andy' the avatar talks with his hands. He is a 3D animation, displaying a distinct personality and natural facial expressions that help him interpret words and phrases for hearing-disabled viewers on their computer screens. The National Science Foundation helped in the development of this avatar. See www.signingavatar.com/ or a Science Daily article about the Signing Avatar.
Here is a signed-story demo called "The Forest."