Downloading Exiv2 0.27.0 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. Exiv2 for Mac lies within Developer Tools, more precisely Webmaster Tools. We recommend checking the downloaded files with any free antivirus. The actual developer of this free Mac application is Andreas Huggel.
From the developer:
Exiv2 is a cross-platform C++ library and a command line utility to manage image metadata. It provides fast and easy read and write access to the Exif, IPTC and XMP metadata and the ICC Profile embedded within digital images in various formats. Exiv2 is available as free software and is used in many projects, including KDE and Gnome Desktops as well as many applications, such as GIMP, darktable, shotwell, GwenView and Luminance HDR.
You may want to check out more Mac applications, such as Browsealoud, RAGE WebDesign or solr, which might be related to Exiv2.