Free
Filtron
Free App for Shutterbugs
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Better than iPhoto in every way
Full-featured HDR photo software
PixelStyle Photo Editor for Mac is an excellent and all-in-one photo editing and graphic design software.
Flickrize your desktop
Add effects to an image without modifying the original
Flickery: A Comprehensive Photography Tool for Mac
Design frames for your photos
Intuitive and User-Friendly Image Editor and Converter
Intuitive image-sorting program for multiple operating systems
Crop and more, without the fuss
Download Adobe Photoshop for Mac : A powerful graphics and photo editor
Unleash your creativity with Adobe Photoshop Lightroom for Mac
Central distribution platform
Comprehensive Update for Adobe Photoshop on Mac
Google’s old answer to iPhoto