"Namexif™ is a tool to automatically rename photos with the date they were shot.
Digital cameras have their own clock and record the date to each photos with a precision of a second. Since the date and time is recorded for each photos (provided it is an EXIF compliant digital camera), Namexif™ is able to rename these photos according to the date.
# Doing so will: make chronological order same as alphabetical one,
# set a unique name to your photos"
Esto es lo que dice en su página. Basicamenet sirve para renombrar las fotos cuando salen de la cámara y ponerlas por orden cronológico. Año-Més-Día-Hora
Y es gratuito
http://www.digicamsoft.com/softnamexif.html