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Re:Introducing the ‘mozjpeg’ Project by pornel on Wednesday March 05, 2014 @04:45PM (#7350174)
There's already a "mozpng", it's called Zopfli. There's also AdvPNG which compresses PNGs with 7-zip's deflate implementation.

And if you want much much smaller PNGs, then try http://pngquant.org or http://pngmini.com/lossypng.html

Re:Introducing the ‘mozjpeg’ Project by sovok on Wednesday March 05, 2014 @07:20PM (#7350966)
Or try ImageOptim, which bundles these and other tools with a nice GUI: http://imageoptim.com/
Re:Introducing the ‘mozjpeg’ Project by nness on Wednesday March 05, 2014 @11:01PM (#7351783)
ImageOptim also bundles PNGOUT, which I find to have exceptional compression when compared to the others (but it is a bit slower)