FotoFind for Mac

FotoFind lets you add location information from a GPX file directly to iPhoto. Useful if you have GPS tracks from where you have been and want to add that info to iPhoto without manually adding places.

Select your GPX file, and FotoFind will fetch images from iPhoto that have matching time. You can adjust time if there is an offset. Then you can use a map to make sure locations are correct and sort through which ones you want to update. Once you are done it will update the iPhoto library with the new information.