ExifToolGUI is a tool for viewing/editing metadata inside a long list of file types including document, audio, video, image, PDF, and more. For images, the program can both view and edit metadata information such as camera/device used, settings on the device, and even map the location
the picture was taken if the camera has GPS capability. The program also supports IPTC and XMP tags, has batch capability, and can import/export all tags.
http://u88.n24.queensu.ca/~bogdan/