ImageOptim - Faster web pages and apps.
Metadata++ - Homepage of Metadata++, free, intuitive and powerful EXIF, IPTC, XMP, ICC, GPS viewer/editor.
FILEminimizer Pictures - FILEminimizer Pictures compresses JPEG photos, TIFF, BMP and PNG images and pictures by up to 98%.
PhotoME - PhotoME is a powerful tool to show and edit the meta data of image files.
Shrink O'Matic - Shrink O'Matic is an AIR application to easily (batch) resize (shrink) images.
Exif Pilot - Exif Pilot is a Free EXIF Editor that allows you to manipulate META data within image files.