Hugin

Open source tool for creating panoramic images

Tools for calculating pixel values and the area of images

A full version photo editing tool that's rich with features and reasonably smart to use

A program developed for Macs by Rafif Yalda that edits photos for Instagram

Electronics Arts' gaming platform offers a wealth of social tools and some of the biggest AAA games around

A comprehensive and well-designed image viewer for Mac that allows all types of image files