Dr. Dobb's. ExifTool by Phil Harvey. Read, Write and Edit Meta Information! Also available --> Utility to fix Nikon NEF images corrupted by Nikon software ExifTool is a platform-independent Perl library plus a command-line application for reading, writing and editing meta information in a wide variety of files. ExifTool supports many different metadata formats including EXIF, GPS, IPTC, XMP, JFIF, GeoTIFF, ICC Profile, Photoshop IRB, FlashPix, AFCP and ID3, as well as the maker notes of many digital cameras by Canon, Casio, DJI, FLIR, FujiFilm, GE, GoPro, HP, JVC/Victor, Kodak, Leaf, Minolta/Konica-Minolta, Motorola, Nikon, Nintendo, Olympus/Epson, Panasonic/Leica, Pentax/Asahi, Phase One, Reconyx, Ricoh, Samsung, Sanyo, Sigma/Foveon and Sony.
ExifTool is also available as a stand-alone Windows executable and a MacOS package: (Note that these versions contain the executable only, and do not include the HTML documentation or other files of the full distribution above.)
Perl Programming. O'Reilly Conferences, July/13.