digiKam - Professional Photo Management with the Power of Open Source
Metadata++ - Homepage of Metadata++, free, intuitive and powerful EXIF, IPTC, XMP, ICC, GPS viewer/editor.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
Exif Pilot - Exif Pilot is a Free EXIF Editor that allows you to manipulate META data within image files.
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
PhotoME - PhotoME is a powerful tool to show and edit the meta data of image files.