Whenever I see a gif, I feel something is missing.
That is the SOUND.
That missing motivated me to blend the sound with gif.
And I believed if I season it with some interactions, it would be wonderful. GIFi is the more interactive GIF supporting sound effects.

This project implements tools for the new image format, GIFi, in Java and Javascript.
gifi4j supporting Java contains GIFi creator, encoder, decoder, and player.
gifi4js supporting Javascript contains GIFi decoder and player.

For detailed description about the project, please see the wiki.