Photo Geotagger - BIIT is here to modify your photo's metadata. Features includes geo-tagging photos, modifying date time, tagging your friends in a photo and other things. You can apply the metadata detail on album level and also on selected photos.
You can also share the applied metadata via email to use it with the desktop version to apply that metadata to your photos anywhere without changing their original properties.
You can find the Windows and OS X version to work remotely on the same photos at www.biit.edu.pk and Apple store respectively!