FLIF is a lossless image format which "outperforms PNG, lossless WebP, lossless BPG, lossless JPEG2000, and lossless JPEG XR
in terms of compression ratio."
Besides being patent-free and LGPL licensed, one of the more useful features is in the interlaced images. Need a 1:2 or 1:4 sized image? Then don't read all of the file! I'm not sure if there are markers in the file which let you find out these boundaries, but it is a new file format so who knows what'll happen between now and version 1.0.
