Free Image Helper Tools for Macintosh - Useful Graphics Utilities
Free tools and utilities to help you work with images in Macintosh. Includes screen rulers, magnifiers, measuring tools, capture utiltiies, background previewers, and other utilities for special image tasks.
ARTIS Screen Ruler for Mac OS X
This free screen ruler can measure pixels, inches, or centimeters and also features transparency adjustment so it doesn't get in your way.
Color MYKser (Mac)
Freeware - Mac only stand-alone application that helps designers calculate 2 CMYK colors for mixing, multiplying, subtracting, etc.
Free Ruler (Mac)
A free screen ruler for Mac OS X. Measure in pixels, inches, picas, or centimeters. Many more customizable features.
Lupe (Mac)
Displays a magnified view of whatever is under your mouse cursor. Freeware.
PhotoToolCM (Mac)
"Contextual menu plugin that helps you manage/organize JPEG photo image files taken by digital cameras." Freeware.