Metadata++ - Homepage of Metadata++, free, intuitive and powerful EXIF, IPTC, XMP, ICC, GPS viewer/editor.
Fragment - A powerful image viewing suite with advanced metadata info
PhotoME - PhotoME is a powerful tool to show and edit the meta data of image files.
ImageGlass - You can use Image to view your digital images and photos of many different formats.
Jimpl - Free online photo metadata and EXIF data viewer. Uncover hidden data of your pictures. Upload a photo to find where, when, and how it was taken.
IrfanView - IrfanView ... one of the most popular viewers worldwide.