CL-PNG used to be called PNG, and was originally written by Harald Musum?. It is now maintained by Vebjorn Ljosa, and can be downloaded from http://www.ljosa.com/~ljosa/software/cl-png/.
Version 0.6 was released on 2009-02-08.
Since version 0.5, CL-PNG uses a foreign function interface to call libpng, the official PNG reference library. As a result, it benefits from all the effort that has been put into that library: CL-PNG is much faster than before, and better able to handle corner cases.
Download ASDF package from http://www.ljosa.com/~ljosa/software/cl-png/download/cl-png-0.6.tar.gz
This page is linked from: PNG Vebjorn Ljosa
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