Php-EAN13-ISBN13-Converter is a project mainly written in ..., it's free.
This classes can convert an EAN-13 to an ISBN-13 and vice versa, using xml provided by http://www.isbn-international.org/page/ranges .
This classes can convert an EAN-13 to an ISBN-13 and vice versa. It uses the RangeMessage.xml, provided by http://www.isbn-international.org/page/ranges .
You can find examples in the examples.php file.