What software can I use to read png metadata?

Problem

I know that I can create a simple little Qt based application that adds and read png metadata, using the QImage.setText(...) and QImage.text(...). That metadata can then be read with a linux command called pngmeta. But what other image software can I use to read out the png metadata? Please note that I'm seeking image programs for the common platforms, so please specify if your application is for Windows or Linux. To make the question clearer I attached a img with some test metadata attached to it. Thanks Johan Links: http://en.wikipedia.org/wiki/Portable_Network_Graphics - png http://en.wikipedia.org/wiki/Extensible_Metadata_Platform - xmp metadata