PEL(PHP Exif Library). A library for reading and writing Exif headers in JPEG and TIFF images using PHP.
The PHP JPEG Metadata Toolkit. Allows reading, writing and display of the following JPEG metadata formats: EXIF 2.2, XMP / RDF, IPTC-NAA IIM 4.1 ect
ExifTool by perl. The ExifTool is excellent. It’s basically got it all – EXIF, IPTC and XMP support (read/write) and support for manufacturer extensions.