MNG - Multiple-image Network Graphics

Home page of MNG: A PNG-like Image Format Supporting
Multiple Images, Animation and Transparent JPEG. Was released on 31 January 2001.
MNG includes a number of interesting features:

* object or sprite-based approach to animation, with commands to move, copy and paste images (rather than replicate them as in GIF)
* nested loops for complex animations
* way better compression than GIF animations
* support for difference (or ``delta'') images for still better compression
* integration of both PNG and JPEG-based (``JNG'') images
* support for transparent JPEG images
* low-complexity and very low-complexity subsets for simpler implementation